Chronic health conditions and school experience in school-aged children in 19 European countries.

This study investigates chronic conditions (CC) prevalence among children in mainstream schools, their school experience and life satisfaction in Europe. Data were collected from the 2017/2018 HBSC survey, a cross-national study using self-reported questionnaires administered in classrooms. Nationally representative samples of children aged 11, 13, and 15 years in mainstream schools from 19 European countries (n = 104,812) were used. School experience was assessed using four variables: low school satisfaction, schoolwork pressure, low teacher support, and peer-victimization, which were related to life satisfaction. Latent class analysis (LCA) was conducted to identify patterns of school experience among students with CC. The prevalence of CC varied from 8.4 (Armenia) to 28.2% (Finland). Children with CC (n = 17,514) rated their school experience and life satisfaction lower than children without CC. LCA identified three school experience patterns: "negative on all items" (37%), "negative on all items, except school pressure" (40%) and "overall positive" (23%). The distribution of subgroups varied across countries-in countries with a higher proportion of children with CC in mainstream schools, children reported more negative school experiences. Compared to the "overall positive" group, low life satisfaction was highest for students classified as "negative on all items" (relative risk (RR) = 2.9; 95% CI 2.2-3.8) with a lesser effect for "negative on all items, except school pressure" (RR) = 1.8; 95% CI 1.4-2.4). These findings provide cross-national data documenting the diversity in inclusive educational practices regarding school placement and school experiences, and suggest that efforts are still needed to allow a fully inclusive environment.

Love and Dating Patterns for Same- and Both-Gender Attracted Adolescents Across Europe.

Sexual orientation is a multidimensional phenomenon, which includes identity, behavior, and attraction. The attraction component, however, is less studied than the other two. In this article, we present the development of a two-item measure to identify adolescents who prefer same- and both-gender partners for love and dating. The questions were administered to nationally representative samples of 15-year-old adolescents in eight European countries and regions participating in the Health Behaviour in School-aged Children (HBSC) cross-national study. The distribution of attraction, as operationalized by preference for the gender of love and dating partners, was similar across countries. These questions offer an alternative or supplementary approach to identify same- and both-gender attracted youth, without administering questions related to sexual identity.

Sexual Health questions included in the Health Behaviour in School-aged Children (HBSC) Study: an international methodological pilot investigation.

BACKGROUND: This paper describes the methodological developments of the sexual health items included in the Health Behaviour in School-aged Children (HBSC) study since their mandatory inclusion in the study in 2002. The current methodological, ethical and pedagogical challenges in measuring young people's sexual health behaviours are discussed along with the issues associated with the sexual health items introduced to the HBSC study in 2002. The development and piloting of new cross-national items for use in the 2013/14 HBSC data collection are presented and discussed. METHODS: An international pilot study was undertaken to determine the impact of these proposed changes. Questionnaires and classroom discussion groups were conducted in five pilot countries in 2012/2013 (France, Hungary, Ireland, Portugal and Romania) with a total of 612 school-aged children (age M = 15.55 years, SD = 0.95). RESULTS: The majority of participants in each country provided positive feedback about the appropriateness of the questions. Some small cross-national differences were found in the self-reported quantitative data relating to the appropriateness of the questions (χ2 = 22.831, df = 9, p = .007, V = .117). Qualitative feedback suggests that for the vast majority of students the phrasing and age-targeting of the questions were considered appropriate. With the exception of a small number of respondents who commented on the clarity and/or personal nature of the content, no specific issues with the questions were identified. CONCLUSIONS: These findings provide guidance on the answerability (including the extent of missing and inconsistent data), understandability, acceptability (including in different cultures) and relevance of questions to potential participants. The findings from the pilot study suggest that in general, the questions are understandable, acceptable, and of a high priority to the target population, and that the simplification has significantly reduced the proportion of missing data. The new developments thus enhance the capacity of the questions to measure cross-nationally, sensitive aspects of young people's sexual behaviour. These questions were included in the 2013/2014 round of the HBSC survey and will continue to be used to monitor trends in adolescent sexual health and behaviours, and to inform and influence health services and health education policy and practice at local, national and international levels.

Gendered trends in early and very early sex and condom use in 20 European countries from 2002 to 2010.

BACKGROUND: Sexual activity is often initiated during the adolescent period, and previous research suggests that the age of first sexual intercourse and condom use are crucial determinants of later sexual health. This study examined trends in adolescent sexual behaviours from 2002 to 2010 in 20 countries across four geographical regions of Europe. METHODS: Data were collected by self-report questionnaires from 15-year-olds in classrooms during 2002, 2006 and 2010. Linear time trends were determined through logistic regression models, stratified for gender. RESULTS: No linear trend over time was documented for most countries for sexual intercourse at the age of 13 or younger. Increased initiation among girls in Eastern Europe and decreased very early initiation among girls in Northern Europe emerged, along with a general increase in condom use in boys and most notably in girls. CONCLUSION: Overall prevalence of early and very early sexual intercourse initiation was quite stable in Europe between 2002 and 2010, while condom use increased. More detailed research and policy attention to the antecedents of non-condom use among young people is warranted; and further study of the relationships between age of sexual initiation and condom or pill use would be particularly valuable.

Adolescents' medicine use for headache: secular trends in 20 countries from 1986 to 2010.

BACKGROUND: This study reports secular trends in medicine use for headache among adolescents in 20 countries from 1986 to 2010. METHODS: The international Health Behaviour in School-aged Children (HBSC) survey includes self-reported data about medicine use for headaches among nationally representative samples of 11-, 13- and 15-year-olds. We included 20 countries with data from at least three data collection waves, with a total of 380 129 participants. RESULTS: The prevalence of medicine use for headaches varied from 16.5% among Hungarian boys in 1994 to 62.9% among girls in Wales in 1998. The prevalence was higher among girls than boys in every country and data collection year. The prevalence of medicine use for headaches increased in 12 of 20 countries, most notably in the Czech Republic, Poland, Russia, Sweden and Wales. CONCLUSION: The prevalence of medicine use for headaches among adolescents is high and increasing in many countries. As some medicines are toxic this may constitute a public health problem.

Decreases in adolescent weekly alcohol use in Europe and North America: evidence from 28 countries from 2002 to 2010.

BACKGROUND: This study examined trends in adolescent weekly alcohol use between 2002 and 2010 in 28 European and North American countries. METHODS: Analyses were based on data from 11-, 13- and 15-year-old adolescents who participated in the Health Behaviour in School-Aged Children (HBSC) study in 2002, 2006 and 2010. RESULTS: Weekly alcohol use declined in 20 of 28 countries and in all geographic regions, from 12.1 to 6.1% in Anglo-Saxon countries, 11.4 to 7.8% in Western Europe, 9.3 to 4.1% in Northern Europe and 16.3 to 9.9% in Southern Europe. Even in Eastern Europe, where a stable trend was observed between 2002 and 2006, weekly alcohol use declined between 2006 and 2010 from 12.3 to 10.1%. The decline was evident in all gender and age subgroups. CONCLUSIONS: These consistent trends may be attributable to increased awareness of the harmful effects of alcohol for adolescent development and the implementation of associated prevention efforts, or changes in social norms and conditions. Although the declining trend was remarkably similar across countries, prevalence rates still differed considerably across countries.

Socialization instances linked to cannabis experimentation among French teenagers.

France presents one of the highest prevalence of teenagers aged 15-year-olds who report they already have experienced cannabis in Europe. Data from the French 2010 Health Behavior in School-aged Children (HSBC) survey and environmental parameters typifying schools' neighborhoods were used to study cannabis experimentation. We conducted a two-level logistic regression (clusters being schools) on 4,175 French 8th-10th graders from 156 schools. Several individual parameters were linked to cannabis experimentation. Living in a non-intact family, feeling insufficiently monitored, having poor communication with mother and being from a family with a high socio-economic status (SES) were all associated with increased risk of cannabis experimentation. At environmental level, only being in a priority education area was linked to this behavior, without explaining differences among schools.

Not early drinking but early drunkenness is a risk factor for problem behaviors among adolescents from 38 European and North American countries.

BACKGROUND: Many studies have reported that the earlier the age at first drink (AFDrink) the higher the later drinking levels and related problems. However, unless adolescents proceed into drunkenness, it is unclear why consuming small quantities at early age should lead to later problems. This study investigates the link between AFDrink and problem behaviors (smoking, cannabis use, injuries, fights, and low academic performance) among 15-year-olds who did and did not proceed into drunkenness. Among those with drunkenness experience, we tested whether AFDrink predicted problem behaviors over and above the age at first drunkenness (AFDrunk). METHODS: Multilevel structural equation models were estimated based on a sample of 44,801 alcohol-experienced 15-year-olds from 38 North American and European countries and regions who participated in the Health Behaviour in School-aged Children cross-national survey. RESULTS: Overall, there was a significant association between AFDrink and all 5 problem behaviors. However, this was the case only among those with drunkenness experiences but not among those never drunk. Among the former, AFDrunk was a strong predictor for all 5 problem behaviors, but time from first drink to first drunk did not predict problem behaviors. CONCLUSIONS: Not early alcohol initiation but early drunkenness was a risk factor for various adolescent problem behaviors at the age of 15, that is, there was not consistent relationship for the time before the first drunkenness (i.e., since first drinking). Besides targeting early drinking, particular efforts are needed to impede early drunkenness to prevent associated harm in adolescence and beyond.

Trends in educational differences in adolescent daily smoking across Europe, 2002-10.

BACKGROUND: Across Europe, tobacco use is more prevalent among secondary school students attending vocational tracks compared with students attending academic tracks. The purpose of the present study is to describe trends in social inequality in daily smoking among adolescents between 2002 and 2010 by addressing both absolute social inequality (prevalence difference between vocational and academic tracks) and relative social inequality (prevalence ratio) in seven European countries. METHODS: Analyses were based on data from 15-year-olds who participated in the Health Behaviour in School-aged Children study in 2002, 2006 and 2010 in Belgium, Croatia, France, Germany, Hungary, Italy and The Netherlands (total N = 32 867). RESULTS: Overall, daily smoking decreased between 2002 and 2010 in Belgium, France, Germany and The Netherlands, increased in Croatia and remained stable in Hungary and Italy. Considerable differences in daily smoking according to educational track existed in all countries. Absolute educational inequalities increased dramatically in Croatia and Italy, while relative inequalities showed a tendency to increase in all countries (significant in Belgium and The Netherlands). CONCLUSIONS: Conclusions on social inequality in adolescent smoking may appear differently when described by absolute and relative measures. Especially the large increase in absolute educational inequalities in daily smoking in Croatia and Italy are worrisome and warrant attention from the public health domain. The findings underline the need for appropriate smoking policies and interventions in vocational schools across Europe.

Peer victimization and subjective health among students reporting disability or chronic illness in 11 Western countries.

BACKGROUND: To compare the strength of the association between peer victimization at school and subjective health according to the disability or chronic illness (D/CI) status of students across countries. METHODS: This study used data from 55 030 students aged 11, 13 and 15 years from 11 countries participating in the 2005-06 Health Behaviour in School-aged Children survey. Self-completed questionnaires were administered in classrooms. Multivariate models of logistic regression (controlled for confounding factors and countries) were used to investigate differences in the association between peer victimization and poor subjective health according to the D/CI status. RESULTS: Overall, 13.5% of the students reported having been bullied at least two or three times a month. The percentage of victims was significantly higher among those reporting D/CI than among others in all countries studied. Victims of bullying were more likely to report poor self-rated health, low life satisfaction and multiple health complaints. However, there were no differences in the associations between peer victimization and subjective health indicators according to the D/CI status. CONCLUSIONS: In all countries studied, students reporting D/CI were more likely to report being victims of bullying. Victims of bullying reported more negative subjective health outcomes regardless of their D/CI status. Although inclusive education is currently a major topic of educational policies in most countries, additional efforts should be made to improve the quality of the integration of students with D/CI.

Life satisfaction in the context of the COVID-19 pandemic among middle school adolescents in France: findings from a repeated cross-sectional survey (EnCLASS, 2012-2021).

Background and aims: Since the COVID-19 pandemic, several studies have reported a decrease in adolescents' well-being. We aim to describe life satisfaction over the last decade and examine the factors associated with its variations between 2020 and 2021 among French students in their last year of middle school (around 14-15 years old). Methods: Data were drawn from a repeated biennial cross-sectional national survey conducted in French schools over the last decade (EnCLASS study), using a self-administered questionnaire. After describing life satisfaction trends between 2012 and 2021 using the Cantril ladder, we examined individual changes in life satisfaction between 2020 and 2021 and their associations with housing and studying conditions during the COVID-19 lockdown, using multinomial logistic regression analysis (decrease, increase, no change as reference). Results: Among the 17,686 survey respondents, an overall slight decrease in the prevalence of adolescents reporting high life satisfaction (i.e., Cantril score ≥6) was observed since 2012 with the lowest proportion reported in 2021 (77.4%). Between 2020 and 2021, 16.3% of French adolescents experienced an improvement in life satisfaction, while 17.7% experienced the opposite. Decrease in life satisfaction between 2020 and 2021 was more likely experienced by adolescents living in reconstructed families [aOR 2.09 (95%CI, 1.58-2.77)], those who did not have their own room [aOR 1.58 (1.16-2.15)], nor access to the Internet to interact with their friends during the lockdown [aOR 1.47 (1.09-1.98)]. Interestingly, more girls than boys were represented in both those reporting increase and decrease in life satisfaction [aOR 1.82 (1.40-2.37) and 1.43 (1.14-1.79), respectively]. Conclusions: This study shows that the way adolescents experienced the first 2020 lockdown in France was not uniform, and that one must consider sex as well as housing and studying conditions when interpreting adolescents' life satisfaction decrease during the COVID-19 pandemic.

Peer victimization among school-aged children with chronic conditions.

Peer victimization is a common problem among school-aged children, and those with chronic conditions are at an increased risk. A systematic review of the literature was carried out to explore the increased risk of peer victimization among children with chronic conditions compared with others, considering a variety of chronic conditions; and to assess intervention programs designed to reduce negative attitudes or peer victimization at school toward children with chronic conditions. Various data sources were used (PubMed, ERIC, PsycINFO, Web of Science), and 59 studies published between 1991 and 2011 and mainly carried out in North American and European countries were included in the review. A higher level of peer victimization among children with chronic conditions was shown for each type of condition explored in this review (psychiatric diagnoses, learning difficulties, physical and motor impairments, chronic illnesses, and overweight). Despite a substantial number of studies having shown a significant association between chronic conditions and peer victimization, intervention studies aiming to reduce bullying among these children were rarely evaluated. The findings of this review suggest a growing need to develop and implement specific interventions targeted at reducing peer victimization among children with chronic conditions.

Smoking Behavior among Adolescents: The Lebanese Experience with Cigarette Smoking and Waterpipe Use.

(1) Background: The study aims to assess cigarette smoking and waterpipe experimentation among Lebanese adolescent school students with respect to their gender, region, age, and socioeconomic status. (2) Methods: This is a cross-sectional study, where students between 11 to 18 years of age were included from all over Lebanon. (3) Results: A total of 1133 students were interviewed. The total proportion of adolescents who ever experimented with cigarette smoking was 24.5%. Males experimented with cigarette smoking more commonly than females (31.9% vs. 19.1%; p < 0.001). Cigarette smoking experimentation was higher among students from the Beirut area (33.6%; p < 0.001) in comparison to other regions, and among those with poor health perception (29.1% vs. 19.8%; p < 0.001) compared to students with excellent health perception. The total proportion of adolescents who ever used a waterpipe was 33.9%. Waterpipes were significantly more experimented with among males than females (40.3% vs. 29.8%; p < 0.001), and among students with bad perception about their health (39.4% vs. 28.9%; p < 0.001). Adolescents who experimented with both cigarettes and waterpipes constitute 22.2% of the studied sample. (4) Conclusions: The rate of tobacco product use is alarming and constitutes a major public health issue for adolescents that urgently needs intervention. The findings raise important policy implications for the development of cigarette smoking prevention programs for youth.

Shedding Light on the Lifestyle and Participation of Portuguese Adolescents with Chronic Conditions-Data from the HBSC 2018 Study.

Variables associated with lifestyle can constitute either risk or protective factors for the development and progression of chronic conditions (CC). This study intends to explore the differences between adolescents with and without CC and between adolescents whose school participation is affected/not affected by the existing CC with regard to variables related to lifestyle (i.e., sleep, physical activity, BMI, and leisure). In addition, it also intends to analyze the influence of these variables (i.e., CC and lifestyle) regarding the adolescents' quality of life (QoL). This work is part of the Portuguese HBSC 2018 study. A total of 8215 adolescents participated (52.7% female), with an average age of 14.36 years (SD = 2.28). The results showed that the adolescents with CC and whose school attendance and participation are affected by their CC exhibit more sleep difficulties (i.e., they experience lower sleep quality and have a higher degree of sleepiness), higher BMI levels (i.e., higher values of overweight and obesity), less participation in leisure activities, and a lower perception of QoL. A higher perception of QoL is associated with school participation unaffected by the existing CC, sleeping well, a low level of sleepiness, a more frequent practice of physical activity, a lower BMI, and a greater involvement in leisure activities. Adolescent health and well-being are a prominent issue in terms of public policies, with behavior and lifestyle playing a significant role in this domain. This message needs to be reinforced in regard to families, educators, healthcare professionals, and public sector policies, particularly concerning students with CC.

Chronic Conditions and School Participation of First-Year University Students-HOUSE ULisbon Study.

Students with chronic conditions (CC) tend to experience several barriers in terms of their school participation and performance. Therefore, the present study aims to explore the factors related to the time of diagnosis of CC (recent/non-recent), the barriers to participation and academic success (health condition, people's attitude towards CC and school physical environment), the physical and mental health (physical/psychological symptoms and concerns) and school-related variables (relationship with teachers and peers), regarding the school participation of first-year students with CC. This work is part of the HOUSE-Colégio F3 Project, University of Lisbon, which includes 1143 first-year university students from 17 Faculties and Institutes of the University of Lisbon. In this specific study, only the subsample of 207 students with CC was considered, 72.4% of which were female, aged between 18 and 54 years (M = 20.00; SD = 4.83). The results showed that students with a recent diagnosis of CC and students with school participation affected by the CC were those who presented more negative indicators regarding barriers to school participation, physical and mental health, and school-related variables. A greater impact of CC in terms of school participation was associated with having a recent diagnosis, with people's attitude towards CC and with the health condition as barriers, with more psychological symptoms and worse relationships with teachers and peers. This is a relevant message for the organization of health services for students with CC at the beginning of their university studies, especially since they are often displaced from home and managing their health conditions alone (in many cases, for the first time).

The medicine use and corresponding subjective health complaints among adolescents, a cross-national survey.

BACKGROUND: Medicine use among children and young people is under-researched. Studies that investigated cross-national patterns in adolescents' medicine use practice are rare. This study aims to investigate adolescents' medicine use for corresponding health complaints in Europe and USA. METHODS: Nationally representative samples of adolescents from 19 countries and regions in Europe and USA completed an anonymous, standardised questionnaire as part of the Health Behaviour in School-aged Children 2005/2006 survey. The prevalence of health complaints and medicine use were determined. The influence of the frequency of medicine use, age, gender and country of residence, on the likelihood of medicine use was assessed using multilevel multivariate logistic regression, with separate analyses for boys and girls. RESULTS: Both health complaints and medicine use were common among adolescents. Medicine use was strongly associated with the frequency of health complaints. The prevalence of both medicine use and health complaints was higher among girls than boys. Boys and girls with weekly health complaints were both similarly likely to report elevated rates of medicine use. CONCLUSIONS: The findings indicated that adolescents who report more frequent recurrent health complaints are also more likely to report more frequent medicine use for their health complaints. Adolescent boys with weekly health complaints have the same risk of medicine use as girls with weekly health complaints. The importance of educating school-aged children to interpret their bodily feelings and complaints and to use medicines appropriately is of high priority.

Socio-demographic and lifestyle factors associated with overweight in a representative sample of 11-15 year olds in France: results from the WHO-Collaborative Health Behaviour in School-aged Children (HBSC) cross-sectional study.

BACKGROUND: The prevalence of overweight in children and adolescents is high and overweight is associated with poor health outcomes over short- and long-term. Lifestyle factors can interact to influence overweight. Comprehensive studies linking overweight concomitantly with several demographic and potentially-modifiable lifestyle factors and health-risk behaviours are limited in adolescents--an age-group characterized by changes in lifestyle behaviours and high prevalence of overweight. Thus, the objective of the current study was to examine the association of overweight with several socio-demographic and lifestyle variables simultaneously in a representative sample of adolescents. METHODS: A nationally representative sample of 11-15 year-olds (n = 7154) in France participated as part of the WHO-Collaborative Health Behaviour in School-aged Children (HBSC) study. Students reported data on their age, height, weight, socio-demographic variables, lifestyle factors including nutrition practices, physical activity at two levels of intensity (moderate and vigorous), sedentary behaviours, as well as smoking and alcohol consumption patterns using standardized HBSC protocols. Overweight (including obesity) was defined using the IOTF reference. The multivariate association of overweight with several socio-demographic and lifestyle factors was examined with logistic regression models. RESULTS: The adjusted odds ratios for the association with overweight were: 1.80 (95% CI: 1.37-2.36) for low family affluence; 0.73 (0.60-0.88) for eating breakfast daily; 0.69 (0.56-0.84) for moderate to vigorous physical activity (MVPA); and 0.71 (0.59-0.86) for vigorous physical activity (VPA). Significant interactions between age and gender as well as television (TV) viewing and gender were noted: for boys, overweight was not associated with age or TV viewing; in contrast, for girls overweight correlated negatively with age and positively with TV viewing. Fruit and vegetable intake, computer and video-games use, smoking and alcohol consumption were not associated with overweight. CONCLUSIONS: In multivariate model, family affluence, breakfast consumption and moderate to vigorous as well as vigorous physical activity were negatively associated with overweight. These findings extend previous research to a setting where multiple risk and protective factors were simultaneously examined and highlight the importance of multi-faceted approaches promoting physical activity and healthy food choices such as breakfast consumption for overweight prevention in adolescents.

[Substance use among young people: From medicine to illicit substances]. / Consommation de substances chez les jeunes : du médicament aux substances illicites.

This paper aims to present the main information presented at the 9th meeting about addictovigilance in 2016 by three healthcare professionals and addiction experts on the issue of substance use in young people. The results of surveys conducted in general population and of specific addictovigilance investigations, bring information on consumption data and use patterns in this population of 11-25years of age. The provision of care, mainly constituted by the Young consumers' consultations, has to adapt to diversified practices, ranging from experiment to substance use disorders, which vary over time and often hidden.

Changes in tooth brushing frequency and its associated factors from 2006 to 2014 among French adolescents: Results from three repeated cross sectional HBSC studies.

OBJECTIVES: This study aimed to evaluate in the changes in the percentage of adolescents who brush their teeth twice a day and the association with socio-economic status and health behaviors between 2006, 2010 and 2014 among adolescents from the French cross-sectional studies of the Health Behavior in School-aged Children (HBSC) survey. METHODS: Our sample included 18727 adolescents aged 11, 13 or 15 years old (y/o). The relationship between toothbrushing frequency (TBF) and eating habits, health and socio-economic status markers, family status, school perception, substance use, sedentary lifestyle and physical activity, together with their evolution over the 3 studies, were investigated using multivariate logistic regression. RESULTS: The proportion of adolescents brushing twice a day increased from 68.8% in 2006 to 70.8% in 2010 and 78.8% in 2014 (p<0.0001). Notable associated factors (p<0.0001) were: being a girl (adjusted Odds Ratio = 1.5) and, even more, an older girl (aOR 1.5 for 15 y/o vs 11 y/o girls), having breakfast (aOR 1.4) and eating fruits daily (aOR 1.6), excellent perceived health (aOR 1.2), obesity or overweight (aOR 0.6), being bullied at school (aOR 0.8), and perceived family wealth (aOR 1.4 for High vs Low). No impact from any associated factor changed over the 3 studies. CONCLUSIONS: Among French adolescents, TBF improved from 2006 to 2014. TBF was significantly associated with other health behaviors. These associations stayed similar in 2006, 2010 and 2010. This increase in TBF may be linked with global prevention programs developed during this time period. These programs should be maintained and associated with more specific ones targeting and adapted to disadvantaged populations, in order to reduce inequalities in oral hygiene and oral health.

Improving attitudes towards children with disabilities in a school context: a cluster randomized intervention study.

AIM: although inclusive education of disabled children is now an accepted practice, it is often challenged by negative peer attitudes. We undertook an interventional study aimed at improving students' attitudes towards their disabled peers. METHOD: the participants were students from the 7th grade of twelve paired schools (1509 students from 62 classes; age 12-13y), randomly allocated to an intervention group (205 males, 285 females) or a control group (132 males, 165 females). The intervention consisted of a mandatory comprehensive educational project on disability. The Chedoke-McMaster Attitudes Towards Children with Handicaps Scale (CATCH) was used to assess children's attitudes before (T0) and after (T1) intervention. The hierarchical structure of the data was taken into account by adjusting standard deviations and using linear multilevel models. RESULTS: seven hundred and eighty-four students had at least one score on the three domains (cognitive, affective, behavioural) of the CATCH at T0 and T1. The final scores were higher than baseline scores (total scores, intervention group: baseline score 25.6 (SD=5.4), final score 26.8 (5.9), p<0.001; CONTROL GROUP: baseline 25.2 (5.4), final 26.0 (5.7), p<0.009) with no significant difference between the intervention and control groups. Individual score changes over time were associated with baseline score (p<0.001 for total and all sub-scores). Lower improvement in attitudes was found in students from schools with special units for their peers with cognitive impairment for total (p=0.013), affective (p<0.001), and behavioural (p=0.001) scores, while higher improvement existed for the cognitive domain (p=0.029). INTERPRETATION: although we found no effect of our intervention, we found an improvement in attitudes in the intervention and control groups that could be a result of the nature of the scales and questionnaires the students had to complete before the intervention.