Subjective measures of socio-economic position and the wealth index: a comparative analysis.

INTRODUCTION: The wealth index is a commonly-used measure of socio-economic position (SEP) in low- and middle-income settings, but there is concern that it is strongly influenced by community-level as well as household-level factors. Subjective SEP indicators are infrequently used in health research. METHODS: We use data from 11 280 households included in the Malawi Integrated Household Survey 2004/5. We compare the wealth index with four subjective measures of SEP: perceived food consumption adequacy, perceived overall consumption adequacy, an economic ladder question, and perceived income sufficiency. The wealth index is compared with each subjective SEP measure in terms of: (i) agreement of classification of households, (ii) targeting accuracy with respect to US$1-a-day poverty based on consumption expenditure, and (iii) the socio-economic processes (household- and community-level) giving rise to the SEP scores. RESULTS: Each subjective SEP indicator resulted in considerable differential classification of households compared with the wealth index. Three measures of subjective SEP (perceived food consumption adequacy, economic ladder question, and perceived income sufficiency) identified a higher proportion of dollar-a-day poor households as poor than the wealth index. The wealth index was strongly influenced by community infrastructure, but all subjective SEP indicators were free from strong community-level influence. CONCLUSION: The strengths and limitations of any measure of SEP depend on the context and purpose for which it is being used. In these data, the wealth index was strongly influenced by community infrastructure, whereas the subjective SEP measures were not, perhaps allowing analyses using them to disentangle household and community influences. Several subjective measures also corresponded to dollar-a-day poverty more strongly than the wealth index. Subjective measures may therefore be preferable to the wealth index in some circumstances, although they have their own set of potential biases.

Issues in the construction of wealth indices for the measurement of socio-economic position in low-income countries.

BACKGROUND: Epidemiological studies often require measures of socio-economic position (SEP). The application of principal components analysis (PCA) to data on asset-ownership is one popular approach to household SEP measurement. Proponents suggest that the approach provides a rational method for weighting asset data in a single indicator, captures the most important aspect of SEP for health studies, and is based on data that are readily available and/or simple to collect. However, the use of PCA on asset data may not be the best approach to SEP measurement. There remains concern that this approach can obscure the meaning of the final index and is statistically inappropriate for use with discrete data. In addition, the choice of assets to include and the level of agreement between wealth indices and more conventional measures of SEP such as consumption expenditure remain unclear. We discuss these issues, illustrating our examples with data from the Malawi Integrated Household Survey 2004-5. METHODS: Wealth indices were constructed using the assets on which data are collected within Demographic and Health Surveys. Indices were constructed using five weighting methods: PCA, PCA using dichotomised versions of categorical variables, equal weights, weights equal to the inverse of the proportion of households owning the item, and Multiple Correspondence Analysis. Agreement between indices was assessed. Indices were compared with per capita consumption expenditure, and the difference in agreement assessed when different methods were used to adjust consumption expenditure for household size and composition. RESULTS: All indices demonstrated similarly modest agreement with consumption expenditure. The indices constructed using dichotomised data showed strong agreement with each other, as did the indices constructed using categorical data. Agreement was lower between indices using data coded in different ways. The level of agreement between wealth indices and consumption expenditure did not differ when different consumption equivalence scales were applied. CONCLUSION: This study questions the appropriateness of wealth indices as proxies for consumption expenditure. The choice of data included had a greater influence on the wealth index than the method used to weight the data. Despite the limitations of PCA, alternative methods also all had disadvantages.

Social capital and mental illness: a systematic review.

STUDY OBJECTIVE: The concept of social capital has influenced mental health policies of nations and international organisations despite its limited evidence base. This papers aims to systematically review quantitative studies examining the association between social capital and mental illness. DESIGN AND SETTING: Twenty electronic databases and the reference sections of papers were searched to identify published studies. Authors of papers were contacted for unpublished work. Anonymised papers were reviewed by the authors of this paper. Papers with a validated mental illness outcome and an exposure variable agreed as measuring social capital were included. No limitations were put on date or language of publication. MAIN RESULTS: Twenty one studies met the inclusion criteria for the review. Fourteen measured social capital at the individual level and seven at an ecological level. The former offered evidence for an inverse relation between cognitive social capital and common mental disorders. There was moderate evidence for an inverse relation between cognitive social capital and child mental illness, and combined measures of social capital and common mental disorders. The seven ecological studies were diverse in methodology, populations investigated, and mental illness outcomes, making them difficult to summarise. CONCLUSIONS: Individual and ecological social capital may measure different aspects of the social environment. Current evidence is inadequate to inform the development of specific social capital interventions to combat mental illness.

Improved cognitive and motor development in a community-based intervention of psychosocial stimulation in northeast Brazil.

The aim of the study was to compare the development of children with and without a programme of psychosocial stimulation in 'control' and 'intervention' sites in a poorly resourced area of northeast Brazil. The sample (n = 156, born 1998) was from a larger cohort. The cohort was tested at 12 months (baseline) with the Bayley Scales of Infant Development. All children in the intervention site with a mental development index (MDI) and/or psychomotor development index (PDI) < or = 100 were enrolled. Each time such a child was enrolled, the next child tested in that site of the same sex and with an index of 101 to 115 was also enrolled, and the next two children matched for sex and scores of < or = 100 and 101 to 115 in the control sites were recruited in parallel. The intervention comprised 14 contacts between 13 and 17 months of age. All children were tested again at age 18 months. The intervention and control groups were similar at baseline for a range of socioeconomic, demographic, environmental, and biological variables, and their MDI and PDI were also similar. At 18 months, the mean differences between the intervention and control groups were + 9.4 points for MDI and + 8.2 points for PDI (p < 0.001 in each case). For children with an initial score of < or = 100, the mean difference between the intervened and control groups was + 11.2 points for MDI (p < 0.001), and + 10.8 points for PDI (p = 0.001). The intervention was thus associated with significant improvements in cognitive and motor development.

Training peer counselors to promote and support exclusive breastfeeding in Bangladesh.

Exclusive breastfeeding is rare in Bangladesh. About 90% of women have home deliveries, so the Baby-Friendly Hospital Initiative has no mechanism to reach them. Mother support groups do not exist, and community health workers do not have time to promote and support exclusive breastfeeding. To provide this kind of support at the community level, an area in Dhaka was selected for a peer-counseling intervention program. Using certain selection criteria, 1 woman from each community was trained as a peer counselor. The training was based on the World Health Organization/United Nations International Children's Emergency Fund 40-hour breastfeeding counseling course and related books. Counseling skills were taught using demonstrations and role play, followed by practical training in the project area. The intervention was very successful, as 70% of the mothers in the project area breastfed their infants exclusively for 5 months compared to only 6% in the control area. The authors describe the peer counseling training, strategies used for peer counseling visits, and lessons learned.

An intervention for the promotion of hygienic feces disposal behaviors in a shanty town of Lima, Peru.

This paper describes the design, implementation and evaluation of an intervention to promote improved hygiene practices in a shanty town area of Lima, Peru. Following formative research, the intervention focused on behaviors associated with the hygienic use of potties by children aged 15-47 months and keeping the home environment free from feces. A health communications strategy was developed involving delivery through routine health services, and using video presentations, leaflets and counseling by health staff during consultations. Intervention activities occurred during a 6-month period in health centers and posts of four intervention communities; four other communities acted as a comparison group. Process and impact indicators were measured through questionnaires and 4-h structured observations conducted in over 600 households both pre- and post-intervention implementation, and through intervention monitoring activities. The intervention materials and approach were well received by the study community; however, in the time-frame of the project only limited coverage of the target audience was achieved, which was insufficient to result in an impact on behaviors. Nevertheless sufficient positive features existed to suggest that with higher coverage, an impact on target behaviors might have been achieved. Reasons for the intervention's shortcomings are discussed and suggestions made for more effective implementation.

Feces, flies, and fetor: findings from a Peruvian shantytown

Sanitary disposal of feces is vital to combat childhood diarrhea, and its promotion is key to improving health in developing countries. Knowledge of prevailing feces disposal practices is a prerequisite to formulation of effective intervention strategies. Two studies were conducted in a shantytown area of Lima, Peru. First, information was gathered through in-depth interviews with mothers and structured observations (4 hours) of young children and their caretakers. Data on beliefs and practices related to feces disposal behaviors were obtained. Excreta were deposited by animals or humans in or near the house in 82% of households observed. Beliefs about feces depended on their source and were reflected in how likely the feces were to be cleared. While 22% of children aged 318 months were observed to use a potty for defecation, 48% defecated on the ground where the stools often remained. Although almost all children were cleaned after defecation, 30% retained some fecal matter on their body or clothes. Handwashing after the child's defecation was extremely rare for both children (5%) and caretakers (20%). The hygienic disposal of feces poses problems in this type of community. Nevertheless existing practices were found that show promise for promotion on a wider scale, including greater use of potties.

La disposición sanitaria de las heces es indispensable para poder combatir la diarrea de la infancia y su promoción es esencial para mejorar la salud en países en desarrollo. Es necesario conocer las prácticas actuales de disposición de excretas a fin de formular estrategias de intervención eficaces. Dos estudios se llevaron a cabo en un barrio pobre de Lima, Perú. En el primero se recolectó información por medio de entrevistas minuciosas a madres y observaciones estructuradas (4 horas) de niños pequeños y sus responsables. Se obtuvieron datos sobre las creencias y prácticas vigentes con respecto a la disposición de excretas. En 82% de los domicilios observados, se encontraron excretas depositadas por animales o seres humanos dentro o en el exterior. Las creencias en torno a las heces dependieron de su origen y se vieron reflejadas en las posibilidades de que las heces fueran recogidas. Aunque se observó que 22% de los niños de 18 meses o más defecaban en un recipiente, 48% defecaban en el suelo, donde las heces a menudo se quedaban. Pese a que a casi todos los niños los limpiaron después de defecar, 30% siguieron teniendo materia fecal en el cuerpo o en la ropa. Los niños (5%) o sus responsables (20%) raras veces se lavaron las manos después de la defecación del niño. En este tipo de comunidad, la disposición sanitaria de las heces plantea un problema. No obstante, se observaron algunas prácticas que apuntan a que en un futuro su promoción, incluido el uso de un recipiente, será más amplia.

Subsequent pregnancies: who has them and who wants them? Observations from an urban center in southern Brazil

Em um estudo de coorte de base populacional, foram estudados todos os 6.011 nascimentos hospitalares ocorridos na cidade de Pelotas, RS, em 1982. As parturientes foram entrevistadas logo apòs o parto, e 80 por cento delas foram novamente contactadas em suas residências no início de 1986, em média 43 meses mais tarde. Dessas mulheres, 39 por cento haviam engravidado novamente. Esta proporçäo variou inversamente em relaçäo à idade materna, anos de escolaridade e renda familiar. Quanto à paridade, a proporçäo de gravidez subsequentes foi maior para primíparas e para multíparas. Mäes cujos filhos nasceram através de cesareana também apresentasram menor fecundidade, mesmo apòs exclusäo daquelas que, por ocasiäo da operaçäo cesárea, sofreram ligadura de trompas. Análise através de regressäo logística mostrou que esses fatores permaneceram significativamente associados à fecundidade mesmo apòs o ajuste estatístico para as demais variáveis. Das mäes que engravidaram apòs 1982, 60 por cento informaram que näo a desejaram. A proporçäo das gravidezes indesejadas foi mais elevada em mulheres de maior paridade, sendo esta tendência mais marcada em mulheres de familias de alta renda