Table 1.
Participant characteristics (N=8072).
| Gender (n=7769; 96.3%)a | |||
|---|---|---|---|
| Girls (n=4380; 54.3%) | Boys (n=3389; 42.0%) | Total (N=8072) | |
| Demographics | |||
| Cohort | |||
| 1, n (%) | 508 (11.6) | 392 (11.6) | 923 (11.4) |
| 2, n (%) | 3872 (88.4) | 2997 (88.4) | 7149 (88.6) |
| Age, M (SD)* | 12.61 (0.61) | 12.66 (0.62) | 12.62 (0.61) |
| Ethnicity* | |||
| White British, n (%) | 3170 (72.4)b | 2680 (79.1)c | 5967 (73.9)d |
| Asian British, n (%) | 519 (11.9)b | 284 (8.4)c | 819 (10.2)d |
| Black British, n (%) | 251 (5.7)b | 150 (4.4)c | 407 (5.0)d |
| Arab British, n (%) | 86 (2.0)b | 63 (1.9)c | 153 (1.9)d |
| Mixed Ethnic Group, n (%) | 230 (5.3)b | 121 (3.6)c | 363 (4.5)d |
| Other, n (%) | 113 (2.6)b | 74 (2.2)c | 191 (2.4)d |
| Clinical Characteristics | |||
| Suicidality, n (%)* | 1032 (23.6)e | 496 (14.6)b | 1611 (20.0)i |
| Suicidal thoughts, n (%)* | 829 (18.9)f | 383 (11.3)g | 1280 (15.9)j |
| Self-harm thoughts, n (%)* | 617 (14.1)f | 234 (6.9)h | 898 (11.1)k |
| Self-harm behaviours n (%)* | 417 (9.5)f | 153 (4.5)h | 599 (7.4)k |
| Pain | |||
| Pain in the past six months (SDQ; n (%))* | 2577 (58.8)l | 1388 (41.0)o | 4124 (51.1)r |
| Pain on assessment day (CHU-9D; n (%))* | 1488 (34.0)m | 859 (25.4)p | 2453 (30.4)s |
| Pain (both six months and todays pain combined; n (%))* | 1196 (27.3)n | 515 (15.2)q | 1794 (22.2)t |
| Depression (CES-D; M (SD))* | 17.62 (11.86)u | 12.74 (9.16)v | 15.57 (11.06)w |
| Normal, n (%) | 2220 (50.7)u | 2348 (69.3)v | 4722 (58.5)w |
| At risk, n (%) | 1244 (28.4)u | 751 (22.2)v | 2087 (25.9)w |
| Caseness, n (%) | 890 (20.3)u | 269 (7.9)v | 1215 (15.1)w |
| Anxiety (RCADS)* | |||
| Non-clinical, n (%) | 3500 (79.9)x | 2912 (85.9)y | 6412 (79.4)z |
| Borderline, n (%) | 231 (5.3)x | 85 (2.5)y | 316 (3.9)z |
| Clinical, n (%) | 455 (10.4)x | 144 (4.3)y | 599 (7.4)z |
| Inhibitory Control Deficits (SDQ; M (SD)) | 4.28 (2.52)l | 4.38 (2.49)v | 4.33 (2.51)aa |
| Normal, n (%) | 3021 (69.0)l | 2280 (67.3)v | 5497 (68.1)aa |
| Borderline, n (%) | 460 (10.5)l | 357 (10.5)v | 855 (10.6)aa |
| High, n (%) | 355 (8.1)l | 292 (8.6)v | 673 (8.3)aa |
| Very high, n (%) | 536 (12.2)l | 439 (13.0)v | 1017 (12.6)aa |
| Peer Problems (SDQ; M (SD))* | 2.11 (1.88)l | 1.95 (1.84)v | 2.06 (1.88)aa |
| Normal, n (%) | 2904 (66.3)l | 2321 (68.5)v | 5401 (66.9)aa |
| Borderline, n (%) | 587 (13.4)l | 430 (12.7)v | 1058 (13.1)aa |
| High, n (%) | 367 (8.4)l | 269 (7.9)v | 663 (8.2)aa |
| Very high, n (%) | 514 (11.7)l | 348 (10.3)v | 920 (11.4)aa |
Note. The star symbol (*) highlights significant gender differences (p<0.05). Proportion of missing data: anxiety (10%), gender and ethnicity (<4%) and all other variables (<1%). Participants with missing data: a.n=303, b.n=11, c.n=17, d.n=172, e.n=7, f.n=10, g.n=14, h.n=13, i.n=18, j.n=24, k.n=23, l.n=8, m.n=18, n.n=20, o.n=25, p.n=31, q.n=37, r.n=34, s.n=54, t.n=62, u.n=26, v.n=21, w.n=48, x.n=194, y.n=248, z.n=745, aa.n=30.