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 | Â | Â | Â | Â | 163 | 50 | 273 | 13,870 | 11,015 | 79.4 |