Table 5.
A comparison of socio-demographic characteristics between those children lost to attrition and those who remain eligible for future follow-up
| Enrolled in ALSPACa | Ineligible for future follow-up due to study attrition | Odds ratio |
|||
|---|---|---|---|---|---|
| Characteristic | Category | n/n (%) | n/n (%) | OR (95% CI) | P > chi2‡ |
| Child sex | Female | 5 470/11 008 (49.69) | 726/1556 (46.66) | 0.86 (0.77–0.96) | 0.010 |
| Child ethnicity | White | 10 505/10 933 (96.09) | 1473/1545 (95.34) | 0.81 (0.62–1.05) | 0.103 |
| Low household income | FSMb | 682/10 959 (6.22) | 177/1544 (11.46) | 2.28 (1.91–2.74) | <0.001 |
aAll pupils, from English GMEs, who are from families that have enrolled in ALSPAC by completing an ALSPAC questionnaire or clinical assessment.
bEligible for ‘free school meals’ (FSM), indicating a joint parental income of ≤£16 000.7 ‡Chi-squared test for homogeneity (equal odds).