Table 3.
Estimates of alcohol- and narcotics-attributable hospitalization or death (ages 30–55), according to birth order and including family fixed effects. Results from Cox regression analyses.
| Alcohol |
Narcotics |
|||
|---|---|---|---|---|
| Model 1 a |
Model 1 a |
|||
| HR | 95% CI | HR | 95% CI | |
| Birth order | ||||
| Second | 1.06 | 0.91–1.24 | 1.15 | 0.90–1.46 |
| Third | 1.02 | 0.80–1.30 | 1.09 | 0.74–1.61 |
| Fourth | 1.19 | 0.85–1.68 | 1.05 | 0.61–1.81 |
| Fifth | 1.30 | 0.82–2.05 | 1.13 | 0.53–2.40 |
| N | 17,934 | 7040 | ||
| Events (N) | 5109 | 2110 | ||
Notes: The sample is restricted to families of two to five children in which all children were born 1943–1960 and in sibling groups with variance on the outcome variable. Reference category is the first-born child. All models are stratified by sex.
HR=Hazard Ratio; CI=Confidence interval; statistical significance: *p < 0.05; **p < 0.01; ***p < 0.001.
a
Stratified by sibling group, and includes dummy variables for child's year of birth.