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Table 1 Background characteristics of children in the two samples

From: Continuous admission to primary school and mental health problems

  Cross-section (n = 4480) RCT (n = 7737)
Males 2214 (49.4%) 3947 (51.0%)
Ages (grades) *
- 5–6 years (grade 2) 1435 (32.0%) 7737 (100%)
- 7–12 years (grades 4–8) 1701 (38.0%) -
- 13–15 years (classes 1–3, i.e. secondary) 1344 (30.0%) -
Both parents lowly educated ** 1514 (33.8%) 1627 (21.3%)
No parent working 17 hours/week or over 331 (7.4%) 305 (3.9%) **
One parent family 372 (8.3%) 499 (6.4%)
No of siblings
- no 341 (7.6%) 1160 (15.0%)
- 1 sibling 2150 (48.0%) 4084 (52.8%)
- more than 1 sibling 1989 (44.4%) 2493 (32.2%)
Outcomes
- CBCL 4171 (93.1%) 7737 (100%)
- CHP assessment 4480 (100%) 7737 (100%)
  1. * In the cross-sectional study 6 children (0.1%) were 4 years old and 5 (0.1%) were 16 years old.
  2. ** Low = less than 16 years at school (i.e. no high level technical or vocational training for 16+ years). In the RCT, data were missing for 94 children regarding parental education, and for 512 regarding parental employment status.