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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%)