Table 3.
Estimates (95% confidence intervals) of incidence rate ratios for Australian citizens arriving from overseas and known to have venous thromboembolism (1981-99)
| Model type | exp(β1) (days 0-7)* | exp(β2) (days 8-14) | exp(β3) (days 15-21) | exp(βs) (sex) | exp(βa) (age) |
|---|---|---|---|---|---|
| Full | 5.17 (3.21 to 8.31) | 2.42 (1.31 to 4.49) | 1.38† (0.64 to 2.98) | 1.18† (0.68 to 2.06) | 1.01† (0.99 to 1.02) |
| Parsimonious | 5.61 (3.94 to 7.97) | 2.63 (1.55 to 4.45) | — | — | — |
*
First week is 7.5 days as time to event is calculated from day 0.5.
†
Variables testing for age and sex dependence of incidence rate ratio and for excess risk in third week are not statistically significant. Variables (β3, βs, βa) are dropped from final (parsimonious) model.