Table 1 Comparison of responders and non-responders by key background variables
From: Adolescent self-harm and suicidal thoughts in the ALSPAC cohort: a self-report survey in England
Remain in study but non-response to the self-harm questionnaire N(%) | Self-harm data available N(%) | χ2 | p-value | ||
|---|---|---|---|---|---|
Gender | Males | 2,640 (58.3%) | 1,997 (41.1%) | 276.0 | <0.001 |
Females | 1,889 (41.7%) | 2,858 (58.9%) | |||
Mother’s social class | Prof/managerial | 1,137 (33.7%) | 1,855 (45.0%) | 103.4 | <0.001 |
Intermediate | 1,814 (53.8%) | 1,895 (46.0%) | |||
Manual | 420 (12.5%) | 370 (9.0%) | |||
Mother’s highest educational qualification | A level/degree | 1,243 (30.0%) | 2,272 (48.1%) | 367.0 | <0.001 |
O-level | 1,543 (37.2%) | 1,569 (33.2%) | |||
LT O-level | 1,364 (32.9%) | 886 (18.7%) | |||
Ethnicity | White | 4,223 (94.4%) | 4,630 (95.9%) | 12.8 | <0.001 |
Non-white | 253 (5.7%) | 196 (4.1%) | |||
GCSE/GNVQs at grades A*-C | 5 or more | 2,120 (52.8%) | 3,373 (80.8%) | 727.0 | <0.001 |
Less than 5 | 1,898 (47.2%) | 803 (19.2%) | |||
Mother’s EPDS score when child aged 11 | Less than 13 | 2,177 (86.2%) | 3,749 (89.1%) | 12.7 | <0.001 |
13 or more | 350 (13.9%) | 460 (10.3%) |