Table 1

Baseline characteristics at individual and cluster level
Intervention Control Total sample
(n= 318) (n= 291) (N= 609)
Individual characteristics
Male, n (%) 217 (68.2) 148 (50.9) 365 (59.9)
Age, M (SD) 17.2 (1.3) 17.4 (1.2) 17.3 (1.3)
Education, n (%)
VMBOa 65 (20.4) 36 (12.4) 101 (16.6)
MBOb 253 (79.6) 255 (87.6) 508 (83.4)
Readiness to changec, n (%) 36 (11.3) 27 (9.3) 63 (10.3)
Outcomes
Heavy drinkingd, n (%) 117 (36.8) 105 (36.1) 222 (36.5)
Frequency of binge drinking, n (%) 205 (64.5) 181 (62.2) 386 (63.4)
Weekly alcohol consumption, M (SD) 12.0 (13.9) 11.3 (13.5) 11.6 (13.7)
Class characteristics
Number 37 36 73
Size, M (SD) 38.6 (19.3) 37.5 (18.2) 38.1 (18.8)

Note.N number of participants, M mean, SD standard deviation. aVMBO: preparatory secondary vocational education. bMBO: secondary vocational education. cReadiness to change alcohol consumption was assessed through one item asking the participants which statement applied best to them. Participants were considered to be ready to change alcohol consumption when they selected “I do not drink alcohol anymore” or “I want to reduce drinking alcohol within the upcoming six months” or “I want to reduce drinking alcohol within the upcoming month” or “I have already reduced drinking alcohol, but less than six months ago”. dDrinking > 7 or 12 (girls/boys aged 15–16 years) or 14 or 21 (females/males aged 17–20 years) glasses of standard units of alcohol per week and/or drinking 5 or more glasses of standard alcohol units per occasion at least once per month for boys and girls aged 15–16 years and at least once per week for males and females aged 17–20 years (= binge drinking).

Voogt et al.

Voogt et al. BMC Public Health 2013 13:694   doi:10.1186/1471-2458-13-694

Open Data