Population sample
This study was conducted from February to August 2015 on a sample of1,000 individuals aged
20 and older. The sample was constructed using the combined quota method [39] (cross-section by age, gender and town of residence) in order to strive for representativeness ofthe population aged 20 and older living in the department of Dakar. Data from the Agence Nationale de
la Statistique et de la Démographie dating from the last census (2013) were used. According to
the last census, the population of the department of Dakar was 1,146,053 in 2013, including
725,373 adults aged 20 and over. The quota variables used were gender (male/female), age (20–
29 / 30–39 / 40–49 / 50–59 / 60 and over, with an upper age limit of 100 years, but concretely,
the oldest participant was aged 90) and town ofresidence. The towns were grouped by the four
arrondissements making up the department of Dakar: Plateau-Gorée (5 towns), Grand Dakar
(6 towns), Parcelles Assainies (4 towns) and Almadies (4 towns). Practically, this method
requires constructing a sample that reflects the proportions observed in the general population.
For example, according to the last census, women aged 20–29 living in town ofMedina (arrondissement ofPlateau-Gorée) represented 1.5% of the population aged 20 and older living in the
department of Dakar. The sample has been constructed so as to reflect this proportion and
include 15 women aged 20–29 living in this town. In order to limit any bias associated with this
sampling method, the investigators worked at different moments of the day (and sometimes on
Saturday and Sunday) and, in each town of residence, began their investigation from different
starting points each day. Pregnant women were excluded from the study.
Population sampleThis study was conducted from February to August 2015 on a sample of1,000 individuals aged20 and older. The sample was constructed using the combined quota method [39] (cross-section by age, gender and town of residence) in order to strive for representativeness ofthe population aged 20 and older living in the department of Dakar. Data from the Agence Nationale dela Statistique et de la Démographie dating from the last census (2013) were used. According tothe last census, the population of the department of Dakar was 1,146,053 in 2013, including725,373 adults aged 20 and over. The quota variables used were gender (male/female), age (20–29 / 30–39 / 40–49 / 50–59 / 60 and over, with an upper age limit of 100 years, but concretely,the oldest participant was aged 90) and town ofresidence. The towns were grouped by the fourarrondissements making up the department of Dakar: Plateau-Gorée (5 towns), Grand Dakar(6 towns), Parcelles Assainies (4 towns) and Almadies (4 towns). Practically, this methodrequires constructing a sample that reflects the proportions observed in the general population.For example, according to the last census, women aged 20–29 living in town ofMedina (arrondissement ofPlateau-Gorée) represented 1.5% of the population aged 20 and older living in thedepartment of Dakar. The sample has been constructed so as to reflect this proportion andinclude 15 women aged 20–29 living in this town. In order to limit any bias associated with thissampling method, the investigators worked at different moments of the day (and sometimes onSaturday and Sunday) and, in each town of residence, began their investigation from differentstarting points each day. Pregnant women were excluded from the study.
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