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Table 1 Description of studies included in SET-Bullying

From: SET-bullying: presentation of a collaborative project and discussion of its internal and external validity

Database name
RESPEKT [9] DFE-SHEFFIELD [8]
Schedule of study measurementsa
 T1: Baseline, May 2002, −3 months
 T2: End of intervention, May 2003, 9 months
 T3: Follow-up 1, May 2004, 21 months
 T4: Follow-up 2, May 2005, 33 months
T1: Baseline, late November/early December 1990, −9 months
T2: End of intervention, late November/early December 1992, 15 months
T3: Follow-up, late November/early December 1993, 27 months
School grades (age in years) of pupils
 Primary school: 5–7th (age: 11–13) Primary school: 3–6th (age: 7–11)
 Secondary school: 8–10th (age: 14–16) Secondary school: 7–18th (age: 12–18)
Number and type of study groups/clusters
 18 primary school grade groups 17 primary school groups
 6 secondary school grade groups 7 secondary school groups
Number of pupils at each study measurementb
 Primary school: T1: 417, T2: 414, T3: 413, T4: 414 Primary school: T1: 2617, T2: 2481, T3: 655
 Secondary school: T1: 329, T2: 354, T3: 364, T4: 365 Secondary school: T1: 4123, T2: 4624
Number (percentage) of female pupils in each measurementb
 Primary school: T1: 228 (54.7 %), T2: 222 (53.6 %), T3: 199 (48.2 %), T4: 210 (50.7 %) Primary school: T1: 1350 (51.6 %), T2: 1234 (49.7 %), T3: 317 (48.4 %)
 Secondary school: T1: 178 (54.1 %), T2: 194 (54.8 %), T3: 166 (45.6 %), T4: 170 (46.6 %) Secondary school: T1: 1977 (48.0 %), T2: 2272 (49.1 %)
  1. a Time in months corresponds to time relative to the start of the intervention
  2. b Number of pupils includes all pupils with a least one non-missing value in any of study outcomes