Table 1.
Baseline characteristics of DSM-IV Generalised Anxiety Disorder (GAD) cases and non-cases at age 16 years in the ALSPAC cohort.
| Characteristics | GAD | No GAD | χ2; p-value |
|---|---|---|---|
| Number | 40 | 5325 | – |
| Age in years, mean (SD) | 15.56 (0.24) | 15.53 (0.31) | 0.603; 0.54a |
| BMI, mean (SD) | 22.55 (3.52) | 21.40 (3.63) | 2.158; 0.03a |
| Female (%) | 90 | 52.3 | 22.63; <0.0001 |
| British White ethnicity (%) | 91.7 | 98.1 | 23.68; 0.003 |
| Father's social class (%) | 3.24; 0.77 | ||
| I | 5.9 | 14.0 | |
| II | 44.1 | 37.3 | |
| III non manual | 8.8 | 12.4 | |
| III manual | 32.4 | 26.3 | |
| IV | 5.9 | 8.0 | |
| V | 2.9 | 2.0 | |
| Maternal highest education (%) | 3.47; 0.48 | ||
| Secondary school | 16.7 | 11.2 | |
| Vocational | 5.6 | 7.8 | |
| O level | 41.7 | 34.7 | |
| A Level | 16.7 | 28.4 | |
| Degree | 19.4 | 17.9 | |
| Maternal age at delivery (%) | 15.13; 0.01 | ||
| <20 | 2.6 | 1.7 | |
| 20–24 | 30.8 | 12.9 | |
| 25–29 | 43.6 | 38.7 | |
| 30–34 | 20.5 | 33.9 | |
| 35–39 | 2.6 | 11.3 | |
| >40 | 0 | 1.5 | |
| History of arthritis in mothers (%) | 8.1 | 3.4 | 2.37; 0.12 |
| History of rheumatism in mothers (%) | 5.4 | 3.9 | 0.21; 0.65 |
| History of arthritis in maternal grandparents (%) | 10.8 | 30.9 | 7.18; 0.06 |
| History of rheumatism in maternal grandparents (%) | 16.2 | 19.5 | 1.26; 0.73 |
a
Independent sample t-test statistic and p-value.