Interplay of Physical, Psychological, and Social Frailty among Community-Dwelling Older Adults in Five European Countries: A Longitudinal Study.

Frailty is a dynamic condition encompassing physical, psychological, and social domains. While certain factors are associated with overall or specific frailty domains, research on the correlations between physical, psychological, and social frailty is lacking. This study aims to investigate the associations between physical, psychological, and social frailty in European older adults. The study involved 1781 older adults from the Urban Health Centres Europe project. Baseline and 1-year follow-up data were collected on physical, psychological, and social frailty, along with covariates. Linear regression analyzed unidirectional associations, while cross-lagged panel modeling assessed bi-directional associations. Participants' mean age was 79.57 years (SD = 5.54) and over half were female (61.0%). Physical and psychological frailty showed bi-directional association (effect of physical frailty at baseline on psychological frailty at follow-up: ß = 0.14, 95%CI 0.09, 0.19; reversed direction: ß = 0.05, 95%CI 0.01, 0.09). Higher physical frailty correlated with increased social frailty (ß = 0.05, 95%CI 0.01, 0.68), but no association was found between social and psychological frailty. This longitudinal study found a reciprocal relationship between physical and psychological frailty in older adults. A relatively higher level of physical frailty was associated with a higher level of social frailty. There was no association between social and psychological frailty. These findings underscore the multifaceted interplay between various domains of frailty. Public health professionals should recognize the implications of these interconnections while crafting personalized prevention and care strategies. Further research is needed to confirm these findings and investigate underlying mechanisms.

Croatian Action on Salt and Health (CRASH): On the Road to Success-Less Salt, More Health.

The World Health Organization recommends adjusting salt intake as a part of the nine global targets to reduce premature mortality from non-communicable chronic diseases as a priority and the most cost-effective intervention. In 2006, the main aim of the Croatian Action on Salt and Health was to decrease salt intake by 16% because of its critical intake and consequences on human health. We have organized educative activities to increase awareness on salt harmfulness, define food categories of prime interest, collaborate with industries and determine salt intake (24 h urine sodium excretion). It was determined that the proportion of salt in ready-to-eat baked bread should not exceed 1.4%. In the period 2014-2022, salt in semi-white bread was reduced by 14%, 22% in bakery and 25% in the largest meat industry. Awareness of the harmfulness of salt on health increased from 65.3% in 2008 to 96.9% in 2023 and salt intake was reduced by 15.9-1.8 g/day (22.8% men, 11.7% women). In the last 18 years, a significant decrease in salt intake was achieved in Croatia, awareness of its harmfulness increased, collaboration with the food industry was established and regulatory documents were launched. However, salt intake is still very high, underlying the need for continuation of efforts and even stronger activities.

Comparison of conventional (face-to-face) and online approach in mindfulness-based chronic disease self-management interventions for older adults.

BACKGROUND: To compare the effectiveness between conventional (face-to-face) and online public health approaches focused on mental health, self-efficacy of health management and quality of life of older adults. DESIGN AND METHODS: Participants will be 65+ residents of the city of Rijeka and the wider urban area and will be divided into three groups. The first group consists of participants who will be included in the conventional (face-to-face) form of public health intervention, the second group consists of participants who will be involved in online public health intervention and the third group consists of participants from the control group. A total of 450 participants will participate in a pretest-posttest non-equivalent groups design research, with 150 participants per group. A series of questionnaires will be administered to evaluate effect of the interventions on mental health, self-efficacy of health management and quality of life. Results of this research will provide insight into the effectiveness of the electronic way of implementing chronic disease self-management interventions compared to conventional (face-to-face) which can be useful to policy makers and public authorities in the organization and implementation of health policies. Expected impact of the study for public health: This research will contribute to the definition, implementation and adaptation of future public health interventions related to mental health, self-efficacy of health management and quality of life in the context of various epidemiological situations such as the current one caused by the COVID-19 pandemic.

Socio-demographic characteristics associated with emotional and social loneliness among older adults.

BACKGROUND: International studies provide an overview of socio-demographic characteristics associated with loneliness among older adults, but few studies distinguished between emotional and social loneliness. This study examined socio-demographic characteristics associated with emotional and social loneliness. METHODS: Data of 2251 community-dwelling older adults, included at the baseline measure of the Urban Health Centers Europe (UHCE) project, were analysed. Loneliness was measured with the 6-item De Jong-Gierveld Loneliness Scale. Multivariable logistic regression models were used to evaluate associations between age, sex, living situation, educational level, migration background, and loneliness. RESULTS: The mean age of participants was 79.7 years (SD = 5.6 years); 60.4% women. Emotional and social loneliness were reported by 29.2 and 26.7% of the participants; 13.6% experienced emotional and social loneliness simultaneously. Older age (OR: 1.16, 95% CI: 1.06-1.28), living without a partner (2.16, 95% CI: 1.73-2.70), and having a low educational level (OR: 1.82, 95% CI: 1.21-2.73), were associated with increased emotional loneliness. Women living with a partner were more prone to emotional loneliness than men living with a partner (OR: 1.78, 95% CI: 1.31-2.40). Older age (OR: 1.11, 95% CI: 1.00-1.22) and having a low educational level (OR: 1.77, 95% CI: 1.14-2.74) were associated with increased social loneliness. Men living without a partner were more prone to social loneliness than men living with a partner (OR: 1.94, 95% CI: 1.35-2.78). CONCLUSIONS: Socio-demographic characteristics associated with emotional and social loneliness differed regarding sex and living situation. Researchers, policy makers, and healthcare professionals should be aware that emotional and social loneliness may affect older adults with different socio-demographic characteristics.

Reliability and Validity of the Tilburg Frailty Indicator in 5 European Countries.

OBJECTIVES: To assess the internal consistency, convergent and divergent validity, and concurrent validity of the Tilburg Frailty Indicator (TFI) within community-dwelling older people in Spain, Greece, Croatia, the Netherlands, and the United Kingdom. DESIGN: Cross-sectional study. SETTING: Primary care and community settings. PARTICIPANTS: In total, 2250 community-dwelling older people (60.3% women; mean age = 79.7 years; standard deviation = 5.7). METHODS: We assessed the reliability and validity of the full TFI as well as its physical, psychological, and social domains. Baseline data of the Urban Health Centers Europe project were used. The internal consistency was assessed with the Cronbach alpha. The convergent and divergent validity were assessed using Pearson correlation coefficients between the domains and alternative measures: the 12-item short-form, Groningen activity restriction scale, 5-item mental well-being scale of the 36-Item Short Form Survey, and the De Jong Gierveld loneliness scale. The concurrent validity was assessed by the area under the receiver operating characteristic curve with physically frail (Survey of Health, Ageing and Retirement in Europe-Frailty Instrument), loss of independence (Groningen activity restriction scale), limited function (Global Activity Limitation Index), poor mental health (5-item mental well-being scale of the 36-Item Short Form Survey), and feeling lonely (De Jong Gierveld loneliness scale) as criteria. RESULTS: The internal consistency of the full TFI was satisfactory with the Cronbach alpha ≥0.70 in the total population and in each country. The internal consistency of the psychological and social domains was not satisfactory. The convergent and divergent validity of the physical, psychological, and social domains was supported by all the alternative measures in the total population and in each country. The concurrent validity of the full TFI and the physical, psychological, and social domains was supported with most area under the receiver operating characteristic curve ≥0.70 in the total population and in each country. CONCLUSIONS AND IMPLICATIONS: The TFI is a reliable and valid instrument to assess frailty in community-dwelling older people in Spain, Greece, Croatia, the Netherlands, and the United Kingdom.

Longitudinal Association Between Physical Activity and Frailty Among Community-Dwelling Older Adults.

OBJECTIVES: To examine the longitudinal association between frequency of moderate physical activity (PA) and overall, physical, psychological, and social frailty among community-dwelling older adults older than 70 years. Second, we assessed the association between a 12-month change in frequency of moderate PA and frailty. DESIGN: Longitudinal cohort study. SETTING: Community settings in Spain, Greece, Croatia, the Netherlands, and the United Kingdom. PARTICIPANTS: A total of 1735 participants (61.1% female; mean age = 79.6 years; SD = 5.5 years). MEASUREMENTS: The frequency of self-reported moderate PA was measured and classified into two categories: "regular frequency" and "low frequency." The 12-month change in frequency of moderate PA between baseline and follow-up was classified into four categories: "continued regular frequency," "decreased frequency," "continued low frequency," and "increased frequency." The 15-item Tilburg Frailty Indicator assessed overall, physical, psychological, and social frailty. RESULTS: Participants who undertook moderate PA with a regular frequency at baseline were less frail at 12-month follow-up than participants with a low frequency. Participants who undertook moderate PA with a continued regular frequency were least frail at baseline and at 12-month follow-up. After controlling for baseline frailty and covariates, compared with participants with a continued regular frequency, participants with a decreased frequency were significantly more overall (B = 1.31; 95% confidence interval [CI] = 0.99-1.63), physically (B = 0.80; 95% CI = 0.58-1.03), psychologically (B = 0.43; 95% CI = 0.30-0.56), and socially frail (B = 0.14; 95% CI = 0.04-0.23) at 12-month follow-up; participants with a continued low frequency were significantly more overall (B = 1.16; 95% CI = 0.84-1.49), physically (B = 0.73; 95% CI = 0.51-0.96), psychologically (B = 0.42; 95% CI = 0.29-0.55), and socially frail (B = 0.13; 95% CI = 0.04-0.23) at 12-month follow-up; the 12-month follow-up frailty level of participants who undertook moderate PA with an increased frequency was similar to those with a continued regular frequency. CONCLUSION: Maintaining a regular frequency of PA as well as increasing to a regular frequency of PA are associated with maintaining or improving overall, physical, psychological, and social frailty among European community-dwelling older adults older than 70 years. J Am Geriatr Soc 68:1484-1493, 2020.

Interventions aimed at loneliness and fall prevention reduce frailty in elderly urban population.

Frailty is a pronounced symptom of aging associated with multiple comorbid states and adverse outcomes. The aim of this study was to evaluate the impact of 2 interventions, one based on prevention of falls and the other on prevention of loneliness, on total frailty and dimensions of frailty in urban community-dwelling elderly as well as associations with independent living.This prospective interventional study followed up 410 persons aged 75 to 95. The participants of the control and intervention groups were monitored through a public health intervention programme. The level of frailty was measured by the Tilburg Frailty Indicator (TFI) questionnaire and the factors of independent living were analyzed using validated questionnaires.After 1 year, physical frailty measured in the control group showed a statistically significant increase (r = -0.11), while in the intervention groups physical frailty did not increase (both P > .05). Psychological frailty measured after 1 year in the control group was significantly higher (r = -0.19), as well as in the group where the public health interventions to reduce loneliness were carried out (r = -0.19). Psychological frailty did not increase in the group in which public health interventions to prevent falls were carried out, and social frailty did not increase at all in the study period. The total level of frailty in the control group after 1 year was significantly increased (r = -0.19), while no increase was seen in the overall frailty in the intervention group. Multivariate analysis has shown that both interventions where independently associated with lower end frailty. Additionally, higher baseline frailty and visit to a physician in the last year were positively associated with higher end-study frailty level, while higher number of subjects in the household and higher total psychological quality of life (SF-12) were independently associated with lower end-study frailty. Only in the prevention of falls group there was no increase in restriction in the activities of daily living throughout study follow-up.Public health interventions to prevent falls and to prevent loneliness have a positive effect on the frailty and independent living of the elderly living in their own homes in an urban community.

A coordinated preventive care approach for healthy ageing in five European cities: A mixed methods study of process evaluation components.

AIMS: To evaluate specific process components of the Urban Health Centres Europe (UHCE) approach; a coordinated preventive care approach aimed at healthy ageing by decreasing falls, polypharmacy, loneliness and frailty among older persons in community settings of five cities in the United Kingdom, Greece, Croatia, the Netherlands and Spain. DESIGN: Mixed methods evaluation of specific process components of the UHCE approach: reach of the target population, dose of the intervention actually delivered and received by participants and satisfaction and experience of main stakeholders involved in the approach. METHODS: The UHCE approach intervention consisted of a preventive assessment, shared decision-making on a care plan and enrolment in one or more of four coordinated care-pathways that targeted falls, polypharmacy, loneliness and frailty. Quantitative data from a questionnaire and quantitative/qualitative data from logbooks were collected among older persons involved in the approach. Qualitative data from focus groups were collected among older persons, informal caregivers and professionals involved in the approach. Quantitative data were analysed by means of descriptive statistics and multilevel logistic regression models. Qualitative data were analysed through thematic analysis. RESULTS: Having limited function was associated with non-enrolment in falls and loneliness care-pathways (both p < .01). The mean rating of the approach was 8.3/10 (SD 1.9). Feeling supported by a care professional and meeting people were main benefits for older persons. Mistrust towards unfamiliar care providers, lack of confidence to engage in care activities and health constraints were main barriers towards engagement in care. CONCLUSIONS: Although the UHCE approach was received generally positively, health constraints and psychosocial barriers prevented older person's engagement in care. IMPACT: Coordinated preventive care approaches for older community-dwelling persons should address health constraints and psychosocial barriers that hinder older person's engagement in care. TRIAL REGISTRATION: ISRCTN registry number is ISRCTN52788952. Date of registration is 13/03/2017.

Association between physical, psychological and social frailty and health-related quality of life among older people.

BACKGROUND: Studies on the association between frailty and health-related quality of life (HRQoL) are scarce and show contradictory results. This study aimed to evaluate the association between physical, psychological and social frailty and HRQoL among community-dwelling older people. METHODS: A cross-sectional study was performed with baseline data collected in 2015 from the Urban Health Centers Europe (UHCE) project in five European countries, the United Kingdom, Greece, Croatia, The Netherlands and Spain. A total of 2325 participants were included in the baseline measurements of the Urban Health Centers Europe project; 2167 participants (mean age = 79.7; SD=5.6) were included in the analyses after excluding participants with missing data. The Tilburg Frailty Indicator measured overall frailty as well as physical, psychological and social frailty. The 12-Item Short-Form Health Survey was used to measured physical and mental HRQoL. RESULTS: Regarding physical HRQoL, a large difference (d=1.29) between physically and not physically frail participants was observed. Regarding mental HRQoL, a large difference (d=1.20) between psychologically and not psychologically frail participants was observed. In the full model with all three domains of frailty and the covariates to explain physical HRQoL, physical (P <0.001) and social frailty (P <0.001) remained significant. In the full model to explain mental HRQoL, all three domains of frailty remained significant (P <0.001). CONCLUSION: Physical frailty had the strongest association with physical HRQoL, and psychological frailty had the strongest association with mental HRQoL. The associations between social frailty and both physical and mental HRQoL remain significant when controlling for physical and psychological frailty.

Health Status, Lifestyle, Use of Health Services, Social Capital and Life Satisfaction As Predictors of Mental Health - Comparative Analysis of Women that Receive and Do not Receive Public Assistance in Croatia.

BACKGROUND: The connection between socio-economic status and health is documented, yet not fully understood. The goal of this research was to analyze the relationship between socio-economic status, lifestyle and health status, availability of health-care, social capital, and satisfaction with life. SUBJECTS AND METHODS: Subjects were 1117 women aged 25-65 years divided in two groups. Group 1 consisted of women who receive public assistance (N1=591), while Group 2 consisted of women who do not (N2=526). The sample was stratified by random choice into multiple stages based on six regions of Croatia, residential area size, and the age of respondents. Visiting nurses surveyed the deprived population, while in Group 2 self-interviewing was conducted. A questionnaire entitled "Inequalities in health" was used. The respondents participated in this research voluntarily and anonymously. RESULTS: Socially deprived women consume spirits and wine more often (p<0.001). There is no difference between groups regarding tobacco consummation. Working women perform significantly less strenuous physical tasks (p<0.001). Deprived women are significantly less engaged in physical activities (p<0.001). Health conditions in deprived women more commonly limit their physical activity (p<0.001). There is a significant difference in utilization of health-care among groups (p<0.001). Younger women who are married, with a higher number of household members, a larger income, and with higher education are generally more satisfied with life (p<0.001). Although deprived women are significantly less satisfied with their lives, feel less free, are less physically active, and less likely to consume spirits or beer, they are significantly happier than working women (p<0.001). CONCLUSIONS: Personal health status and lifestyle, access to health-care services, and life satisfaction have a high importance as predictors and protective factors of mental health in women - recipients of state-provided financial welfare.

The effectiveness of a coordinated preventive care approach for healthy ageing (UHCE) among older persons in five European cities: A pre-post controlled trial.

BACKGROUND: Older persons often have multiple health and social problems and need a variety of health services. A coordinated preventive approach that integrates the provision of health and social care services could promote healthy ageing. Such an approach can be organised differently, depending on the availability and organizational structures in the local context. Therefore, it is important to evaluate the effectiveness of a coordinated preventive care approach in various European settings. OBJECTIVES: This study explored the effects of a coordinated preventive health and social care approach on the lifestyle, health and quality of life of community-dwelling older persons in five European cities. DESIGN: International multi-center pre-post controlled trial. SETTING: Community settings in cities in the United Kingdom, Greece, Croatia, the Netherlands and Spain. PARTICIPANTS: 1844 community-dwelling older persons (mean age = 79.5; SD = 5.6). METHODS: The Urban Health Centres Europe (UHCE) approach consisted of a preventive multidimensional health assessment and, if a person was at-risk, coordinated care-pathways targeted at fall risk, appropriate medication use, loneliness and frailty. Intervention and control sites were chosen based on their location in distinct neighbourhoods in the participating cities. Persons in the catchment area of the intervention sites 'the intervention group' received the UHCE approach and persons in catchment areas of the control sites 'the control group' received care as usual. A questionnaire and two measurements were taken at baseline and at one-year follow-up to assess healthy lifestyle, fall risk, appropriate medication use, loneliness level, frailty, level of independence, health-related quality of life and care use. To evaluate differences in outcomes between intervention group and control group for the total study population, for those who received follow-up care-pathways and for each city separately (multilevel) logistic and linear regression analyses were used. RESULTS: Persons in the intervention group had less recurrent falls (OR = 0.65, 95% CI = 0.48; 0.88) and lower frailty (B=-0.43, 95% CI= -0.65 to -0.22) at follow-up compared with persons in the control group. Physical health-related quality of life and mental well-being was better (B = 0.95; 95% CI = 0.14-1.76; and B = 1.50; 95% CI = 0.15-2.84 respectively). The effects of the UHCE approach were stronger in the subgroup of persons (53.6%) enrolled in care-pathways. CONCLUSIONS: Our study found promising but minor effects for the use of a coordinated preventive health and social care approach for the promotion of healthy ageing of older persons. Future studies should further evaluate effects of coordinated preventive health and social care aimed at healthy ageing. TRIAL REGISTRATION: ISRCTN registry number is ISRCTN52788952. Date of registration is 13/03/2017.

Evaluation design of Urban Health Centres Europe (UHCE): preventive integrated health and social care for community-dwelling older persons in five European cities.

BACKGROUND: Older persons often have interacting physical and social problems and complex care needs. An integrated care approach in the local context with collaborations between community-, social-, and health-focused organisations can contribute to the promotion of independent living and quality of life. In the Urban Health Centres Europe (UHCE) project, five European cities (Greater Manchester, United Kingdom; Pallini (in Greater Athens Area), Greece; Rijeka, Croatia; Rotterdam, the Netherlands; and Valencia, Spain) develop and implement a care template that integrates health and social care and includes a preventive approach. The UHCE project includes an effect and process evaluation. METHODS: In a one-year pre-post controlled trial, in each city 250 participants aged 75+ years are recruited to receive the UHCE approach and are compared with 250 participants who receive 'care as usual'. Benefits of UHCE approach in terms of healthy life styles, fall risk, appropriate medication use, loneliness level and frailty, and in terms of level of independence and health-related quality of life and health care use are assessed. A multilevel modeling approach is used for the analyses. The process evaluation is used to provide insight into the reach of the target population, the extent to which elements of the UHCE approach are executed as planned and the satisfaction of the participants. DISCUSSION: The UHCE project will provide new insight into the feasibility and effectiveness of an integrated care approach for older persons in different European settings. TRIAL REGISTRATION: ISRCTN registry number is ISRCTN52788952 . Date of registration is 13/03/2017.

Temporal variations analyses and predictive modeling of microbiological seawater quality.

Bathing water quality is a major public health issue, especially for tourism-oriented regions. Currently used methods within EU allow at least a 2.2 day period for obtaining the analytical results, making outdated the information forwarded to the public. Obtained results and beach assessment are influenced by the temporal and spatial characteristics of sample collection, and numerous environmental parameters, as well as by differences of official water standards. This paper examines the temporal variation of microbiological parameters during the day, as well as the influence of the sampling hour, on decision processes in the management of the beach. Apart from the fecal indicators stipulated by the EU Bathing Water Directive (E. coli and enterococci), additional fecal (C. perfringens) and non-fecal (S. aureus and P. aeriginosa) parameters were analyzed. Moreover, the effects of applying different evaluation criteria (national, EU and U.S. EPA) to beach ranking were studied, and the most common reasons for exceeding water-quality standards were investigated. In order to upgrade routine monitoring, a predictive statistical model was developed. The highest concentrations of fecal indicators were recorded early in the morning (6 AM) due to the lack of solar radiation during the night period. When compared to enterococci, E. coli criteria appears to be more stringent for the detection of fecal pollution. In comparison to EU and U.S. EPA criteria, Croatian national evaluation criteria provide stricter public health standards. Solar radiation and precipitation were the predominant environmental parameters affecting beach water quality, and these parameters were included in the predictive model setup. Predictive models revealed great potential for the monitoring of recreational water bodies, and with further development can become a useful tool for the improvement of public health protection.

Patterns of internet use and mental health of high school students in Istria County Croatia: cross-sectional study.

AIM: To examine associations between different forms of internet use and a number of psychological variables related to mental health in adolescents. METHODS: A cross-sectional survey was carried out on a representative sample of students (N=1539) from all high schools in the region of Istria in Croatia (14-19 years). The associations between four factors of internet use and nine mental health indicators were analyzed using canonical correlation analysis. RESULTS: The four canonical functions suggested a significant association between different types of internet use and specific indicators of mental health (P<0.001). Problematic internet use, more typical among boys, was associated with general aggressive behavior and substance abuse (P<0.001). Experiences of harassment, more typical among girls, were associated with health complaints, symptoms of depression, loneliness, and fear of negative evaluation (P<0.001). Using the internet for communication and entertainment was associated with better relationships with peers (P<0.001), while use of the internet for academic purposes was associated with conscientiousness (P<0.001). CONCLUSION: The results suggest that different patterns of internet use are significantly associated with specific sets of positive and negative mental health indicators. The data support the assumption that internet use can have both positive and adverse effects on the mental health of youth.

Life satisfaction, optimism and social capital as predictors of mental health of the recipients of financial welfare from the state.

BACKGROUND: Health is largely influenced by the subjective well-being, optimism, social inclusion and satisfaction with life as well as usually defined variables. The aim of this study was to determine the relationship of dimensions of personality (optimism, control over life), social involvement (social capital) and socio-economic status with health and inequalities in health. SUBJECTS AND METHODS: This study was performed on 1017 respondents which were chosen according to set criteria: middle age, working capability, and, according to the documentation of the Centres for social welfare, the recipients of financial welfare from the state. A questionnaire was created from several existing questionnaires with validated indicators. RESULTS: The results show that 78.1% of respondents were unemployed. Regarding the health males express a higher level of health than female. The presence of a chronic disease was found in 56.6% women and 43.4% men. The predictors of health such as optimism, life satisfaction and locus of control showed that satisfaction with life was expressed by 39.7% respondents. Greater satisfaction with life was seen in females (59.6%). Surprisingly, 47.7% of respondents said they thought they had control over their lives and decisions. Women are statistically more optimistic. Almost 60% of respondents were not satisfied with their lives. CONCLUSIONS: Socially deprived population is mainly unemployed with insufficient resources for living. More burdened and higher risk for future development of the disease was found within this population. Optimism, social inclusion and life satisfaction play a large role, as protective factors in health. The interventions demand a multi disciplinary approach, and, with regard to the sensitivity of the population, the best solution is in their own empowerment, as a protective factor for mental health.

Evaluation of equivalence between different methods for enumeration of fecal indicator bacteria before and after adoption of the new Bathing Water Directive and risk assessment of pollution.

The quality of bathing water is of considerable public importance due to the possibility of fecal contamination. In 2009, Croatia implemented the new European Bathing Water Directive (BWD, 2006/7/EC) establishing stricter microbiological standards for new parameters with new reference methods. This study aims to evaluate the equivalence of different methods according to the old and revised BWD and to provide the possibility of data comparison. Furthermore, the directive requires the establishment of the bathing water profile (BWP) for pollution risk assessment. The estimation of consistency of pollution risk assessment with obtained microbiological results was also performed. Six marine beaches of the Municipality of Rijeka (Croatia) were examined during the 2009 season. Statistical analysis showed equivalence between determination methods for fecal contamination indicators. Based on the current water classification results, the need for correction of estimated pollution risks and recommendations for inclusion of historical microbiological data during BWP enactment was noticed.

Microbiological and chemical indicators of water quality in indoor hotel swimming pools before and after training of swimming pool operators.

The present study was undertaken in order to determine the quality of indoor pool waters in hotels along the Croatian coast. We wanted to assess the risks of exposure to microbial and chemical contaminants and find out if training pool operators to use a quality assurance system, that we developed, influenced hygienic conditions and water quality in swimming pools or not. The samples were analysed for free chlorine, pH and several microbiological indicators according to standard laboratory methodologies. Of 1,329 samples tested, 276 were found to be unacceptable either by chemical (148) or microbiological parameters (128). After training, the proportion of unacceptable samples dropped by 23.5%, mostly according to the free chlorine values. According to our results, most of the microbiologically unacceptable samples had chlorine levels within the recommended range but their pH values were too high. A free chlorine level below 0.2 mg/L was found in 106 (82.8%) microbiologically unacceptable samples suggesting the need for maintaining the lower limit at least above 0.2 mg/L in order to reduce microbial risks to a more acceptable level. This measure combined with training of pool operators might result in reduced health risks in pool waters.