Comparison of participating and non-participating cases and controls
| Eligible cases | Eligible controls | |||||
|---|---|---|---|---|---|---|
| Participants (n=193) | Non-participants (n=50) | p Value | Participants (n=223) | Non-participants (n=160) | p Value | |
| *Higher Carstairs index denotes greater social deprivation. | ||||||
| Sex | ||||||
| Boys | 107 (55%) | 24 (48%) | 113 (51%) | 83 (52%) | ||
| Girls | 86 (45%) | 26 (52%) | 0.35 | 110 (49%) | 77 (48%) | 0.82 |
| Year of birth | ||||||
| 1987 | 36 (19%) | 6 (12%) | 44 (20%) | 25 (16%) | ||
| 1988 | 93 (48%) | 23 (46%) | 98 (44%) | 82 (51%) | ||
| 1989 | 64 (33%) | 21 (42%) | 0.33 | 81 (36%) | 53 (33%) | 0.38 |
| Carstairs index in 1995/6* (mean (SD)) | 0.95 (3.96) | 1.60 (4.20) | 0.33 | 0.39 (3.45) | 0.84 (3.71) | 0.24 |
| Social class in 1995/6 | ||||||
| I: Professional | 37 (19%) | 8 (16%) | 38 (17%) | 10 (6%) | ||
| II: Managerial/technical | 69 (36%) | 10 (20%) | 96 (43%) | 62 (39%) | ||
| III: skilled non-manual | 29 (15%) | 10 (20%) | 33 (15%) | 26 (16%) | ||
| III: skilled manual | 34 (18%) | 15 (30%) | 35 (16%) | 29 (18%) | ||
| IV-V: partly/un-skilled | 8 (4%) | 2 (4%) | 9 (4%) | 14 (9%) | ||
| Economically inactive/missing | 16 (8%) | 5 (10%) | 0.22 | 12 (5%) | 19 (12%) | 0.003 |