Univariate associations between socioeconomic characteristics of the parents at the time of delivery of the child and risk of the child developing hyperkinetic disorder
| Controls | Cases | Mother RR (95% CI) | Controls | Cases | Father RR (95% CI) | |
|---|---|---|---|---|---|---|
| Results presented as rate ratios (RR) with 95% confidence intervals (CI) from a conditional logistic regression model. | ||||||
| Cases = 834; controls = 20 100. | ||||||
| Cases and controls are matched for age and sex. | ||||||
| *p<0.05. | ||||||
| Missing information for mothers and fathers respectively: †(742 and 1471); ‡(51 and 291); §(222 and 291); ¶(53 and 301), ††(paternal age 176 missing). | ||||||
| Years of schooling after basic school† | ||||||
| 3+ | 9968 | 303 | 1 | 11688 | 439 | 1 |
| <3 | 9400 | 521 | 1.8 (1.6–2.1) | 6960 | 376 | 1.4 (1.2–1.6) |
| Annual income quartile‡ | ||||||
| Highest | 4673 | 165 | 1 | 6122 | 187 | 1 |
| Second highest | 5353 | 211 | 1.1 (0.9–1.3) | 5333 | 230 | 1.4 (1.1–1.7) |
| Second lowest | 5522 | 215 | 1.1 (0.9–1.4) | 4678 | 210 | 1.5 (1.2–1.8) |
| Lowest | 4503 | 241 | 1.5 (1.2–1.8) | 3696 | 187 | 1.6 (1.3–2.0) |
| Employed§ | ||||||
| Yes (included students) | 10472 | 322 | 1 | 13847 | 485 | 1 |
| No | 9422 | 496 | 1.7 (1.5–2.0) | 5982 | 329 | 1.5 (1.3–1.8) |
| Cohabitant status¶ | ||||||
| Married | 11890 | 389 | 1 | 11928 | 392 | 1 |
| Cohabitant with common children | 5920 | 237 | 1.2 (1.0–1.4)* | 5930 | 238 | 1.2 (1.0–1.4)* |
| Cohabitant without common children | 666 | 47 | 2.1 (1.6–3.0) | 692 | 52 | 2.3 (1.7–3.1) |
| Single | 1574 | 158 | 3.0 (2.5–3.7) | 1269 | 132 | 3.1 (2.5–3.8) |
| Age in years†† | ||||||
| <20 | 612 | 50 | 2.3 (1.7–3.2) | 96 | 4 | 0.9 (0.3–2.6) |
| 20–24 | 4834 | 300 | 1.7 (1.5–2.1) | 2108 | 157 | 1.7 (1.4–2.1) |
| 25–29 | 8185 | 288 | 1 | 6447 | 279 | 1 |
| 30–34 | 4703 | 159 | 0.9 (0.8–1.1) | 6435 | 210 | 0.7 (0.6–1.1) |
| ⩾35 | 1766 | 37 | 0.6 (0.4–0.8) | 4853 | 169 | 0.8 (0.6–0.9) |
| Parity | ||||||
| Primiparity | 9415 | 414 | 1 | |||
| Multiparity | 10685 | 420 | 0.9 (0.8–1.02) | |||