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Table 2 SILNE 2013 Survey: grade and school selection, ethical approval, sample and participation rate per city

From: Smoking in school-aged adolescents: design of a social network survey in six European countries

City (Country) Selected grades Criterion of school selection and stratification of schools Name generator Consent No. of schools invited No. of schools recruited School staff recruited No. of registered adolescents No. of adolescents participating Participation rate %
Namur (BE) Last grade of lower secondary and first grade of upper secondary education (3rd and 4th) Early educational tracking (at the age of 12) Selection and stratification based on the parental socio-economic status index (low SES = index < =14 and High index >14) Roster Passive for parents; active for adolescent 21 7 85 2,375 2,133 89.8
Tampere (FI) Last two grades of lower secondary education (8th and 9th). Later educational tracking (at the age of 16) Selection and stratification of low and high SES based on the average income in the area, proportion of highly educated people in the area (of over-15-year-olds), and distance from the school to the centre of Tampere. Name generator Passive for both 14 8 32 1,744 1,499 86.0
Hannover (DE) Last two grades of lower secondary education (8th and 9th) Early educational tracking (at the age of 10) Selection and stratification of low and high SES based on the average income in the area and the tracking/school types (low, mixed, medium, and high educational tracks). Roster Active for both 64 13 67 2,238 1,476 66.0
Latina (IT) First two grades of upper secondary education (9th and 10th) Later educational tracking (at the age of 14) Selection and stratification of low and high SES based on school type: vocational and high schools. Roster Active for both 12 8 36 2,727 2,085 76.5
Amersfoort (NL) Last two grades of lower secondary education (3rd and 4th) Early educational tracking (at the age of 12) Selection and stratification of low and high SES based on the available school tracks in the school: vocational level, middle, and high level. Roster Passive for both 38 8 28 2,377 1,922 80.9
Coimbra (PT) First two grades of upper secondary education (10th and 11th) Later educational tracking (at the age of 15) Selection and stratification of low and high SES based on the average income in the area and school type: vocational and general schools. Roster Passive for both, but one school 14 6 25 2,409 1,900 78.9
Total      163 50 273 13,870 11,015 79.4