Table 1.
Descriptive statistics of psychotic experiences at age 13 years with confounding and outcome variables
| Total* |
Psychotic experiences at 13 years |
|||
|---|---|---|---|---|
| No | Yes | |||
| Total | 6361 (100%) | 5627 (89%) | 734 (12%) | |
| Sex | ||||
| Male | 3131 (49%) | 2794 (50%) | 337 (46%) | |
| Female | 3230 (51%) | 2833 (50%) | 397(54%) | |
| Maternal marital status | ||||
| Single (never married) | 863 (14%) | 733 (13%) | 130 (19%) | |
| Married | 5046 (81%) | 4523 (82%) | 523 (74%) | |
| Widowed, divorced, or separated | 302 (5%) | 251 (5%) | 51 (7%) | |
| Maternal highest academic qualification | ||||
| Compulsory education | 5133 (84%) | 4518 (83%) | 615 (87%) | |
| Degree or higher | 1005 (16%) | 914 (17%) | 91 (13%) | |
| Binge eating at 18 years | ||||
| No | 2474 (96%) | 2236 (96%) | 238 (92%) | |
| Yes | 107 (4%) | 87 (4%) | 20 (8%) | |
| Purging at 18 years | ||||
| No | 2408 (94%) | 2177 (94%) | 231 (90%) | |
| Yes | 156 (6%) | 130 (6%) | 26 (10%) | |
| Fasting at 18 years | ||||
| No | 2297 (89%) | 2089 (90%) | 208 (80%) | |
| Yes | 291 (11%) | 240 (10%) | 51 (20%) | |
| Excessive exercise at 18 years | ||||
| No | 2472 (96%) | 2220 (96%) | 252 (97%) | |
| Yes | 101 (4%) | 93 (4%) | 8 (3%) | |
| Any disordered eating at 18 years | ||||
| No | 2079 (82%) | 1899 (83%) | 180 (71%) | |
| Yes | 453 (18%) | 380 (17%) | 73 (29%) | |
| Maternal age | 29·1 (4·6) | 29·2 (4·5) | 28·5 (4·8) | |
| Maternal depressive symptoms | 6·4 (4·6) | 6·3 (4·5) | 7·4 (4·8) | |
| Child's BMI (Z scores) | ||||
| At 13 years | 0·3 (1·1) | 0·3 (1·1) | 0·3 (1·1) | |
| At 18 years | –0·3 (1·0) | –0·3 (1·0) | –0·2 (0·9) | |
| Child's depressive symptoms at age 13 years | 3 (1–5) | 3 (1–5) | 6 (3–10) | |
| Child's autistic traits at age 7 years | 2 (0–4) | 1 (0–4) | 2 (0–4) | |
| Number of disordered-eating behaviours | 6 (3–9) | 6 (3–9) | 7 (4–11) | |
Data are n (%), mean (SD), or median (IQR). BMI=body-mass index.
*
Distribution (ie, numbers and proportions) of confounding and outcome variables refers to the sample of children with available exposure data (our analytical sample) shown in the first row of the table.