Two multivariate meta-regression models for studies of all autism spectrum disorders (n = 23)
| Covariate | Odds ratio | 95% CI (odds ratio) | p value | |
|---|---|---|---|---|
| Model 1—including age | ||||
| Diagnostic criteria | Not ICD-10 or DSM-IV | 1.00 | – | – |
| ICD-10 or DSM-IV | 2.61 | 1.40 to 4.85 | 0.003 | |
| Age (years) | 0.85 | 0.85 | 0.76 to 0.96 | 0.006 |
| Intercept | 1.45×10−3 | 1.45×10−3 | 3.25×10−4 to 6.45×10−3 | <0.001 |
| Model 2—including study area | ||||
| Diagnostic criteria | Not ICD-10 or DSM-IV | 1.00 | – | – |
| ICD-10 or DSM-IV | 3.48 | 1.92 to 6.33 | <0.001 | |
| Area | Rural/mixed | 1.00 | – | – |
| Urban | 2.85 | 1.47 to 5.53 | 0.002 | |
| Intercept | 2.03×10−4 | 7.15×10−5 to 5.73×10−4 | <0.001 |