Table 2

Sample descriptive statistics

Imputation sample
5401
% (SE)
Complete case sample
1617
n (%)
Educational outcomesn=5401
 Capped GCSE score: mean (SE)350 (1.01)376 (1.31)
 Five or more A*–C grades at GCSE74.4% (SE=0.6)1420 (87.8%)
 Four or less A*–C grades at GCSE25.6% (SE=0.6)197 (12.2%)
Exposuren=2264
 MRB total: mean (SE)3.24 (0.31)3.01 (0.05)
Sexn=5401
 Female55.5% (SE=0.7)975 (60.3%)
 Male44.5% (SE=0.7)642 (39.7%
Season of birthn=5401
 Autumn33.9% (SE=0.6)542 (33.5%)
 Winter14.8% (SE=0.5)222 (13.7%)
 Spring23.4% (SE=0.6)382 (23.6%)
 Summer27.9% (SE=0.6)471 (29.1%)
Maternal educationn=5214
 Degree14.9% (SE=0.5)311 (19.2%)
 A level25.9% (SE=0.6)479 (29.6%)
 O level34.3% (SE=0.7)596 (36.9%)
 <O level21.5% (SE=0.6)231 (14.3%)
Parental socioeconomic positionn=4970
 Professional14.1% (SE=0.5)291 (18.0%)
 Managerial and technical41.2% (SE=0.7)761 (47.1%)
 Skilled non-man23.6% (SE=0.6)398 (24.6%)
 Skilled man, part or unskilled13.2% (SE=0.5)167 (10.3%)
Housing tenuren=5227
 Mortgage/owned84.7% (SE=0.5)1.444 (89.3%)
 Private rent7.3% (SE=0.4)88 (5.4%)
 Subsidised rent8.6% (SE=0.4)85 (5.3%)
Incomen=4809
 High20.86% (SE=0.6)364 (22.5%)
 Mid high21.96% (SE=0.6)424 (26.2%)
 Middle21.34% (SE=0.6)364 (22.5%)
 Mid low19.25% (SE=0.6)292 (18.1%)
 Low16.58% (SE=0.5)173 (10.7%)
Free school meals (FSMs)n=5401
 Ever FSM7.7% (SE=0.4)65 (4.0%)
 Never FSM92.3% (SE=0.4)1552 (96.0%)
Special educational needs (SENs)n=5075
 No SEN84.7% (SE=0.4)1522 (94.1%)
 School action6.0% (SE=0.4)68 (4.2%)
 School action plus1.9% (SE=0.2)18 (1.1%)
 Statement of SEN1.4% (SE=0.2)9 (0.6%)
Previous educational attainment/ability
 IQ at age 8: mean (SE)n=4370105 (0.24)109 (0.37)
 KS2 educational attainment: mean (SE)n=4753830 (2.76)901 (3.94)
  • GCSE, General Certificate of Secondary Education; KS2, key stage 2; MRB, multiple risk behaviour.