HDSS Nouna Data

Nouna Health and Demographic Surveillance Survey data The Nouna HDSS covers a population of 105,000 habitants with a mainly rural population (27, 29). The Nouna HDSS is managed by the Health Research Centre of Nouna (Centre de Recherche en Santé de Nouna - CRSN) which has collected data since 1992 (initial census) and control census’ in 1994, 1998 and 2009 (29). The surveillance site was extended in 2000 and in 2004, now counting 58 villages vs. 39 in the initial census and the city of Nouna (29, 30). Vital events were collected up to 3 times (every 120 days) per year besides other information such as verbal autopsies and household questionnaires among others (29). The sampling strategy for the collection of information on educational status could not be reconstructed; information on educational status was given for almost one third of the total sample. See Table S1 in the supporting information for missingness. Additional details on the Nouna HDSS, data collection, and cohort are available elsewhere (27, 29–31). For the current analysis, we extracted data on sex, age, education, survival status, time of visit, and migration status. Individuals entered the study when first observed and exited in case of death, migration out of the Nouna HDSS or other reasons. All individuals observed for at least 1 year (at least 2 observations) with complete data on variables of interest (age, sex, educational attainment, self-reported survival status) who were a (former) resident of the Nouna HDSS in the period 1992 to 2016, and born in or before 1980 were included in our analysis. We limited our sample to those born before 1980 to study old-age survival. Our final sample included 14,892 individuals with a mean observation time of 11.7 years (range: 1.0 - 24.6 years).