Table 3.
IRR of the rate of VTE using various analysis methods
| VTE definition A IRR* (95%CI) |
VTE definition B IRR* (95%CI) |
English data5 IRR (95%CI)† |
Danish data13 IRR (95%CI)† |
|
|---|---|---|---|---|
| Time period | ||||
| Outside pregnancy | Reference | |||
| Antepartum | 5.08 (4.66 to 5.54) | 3.80 (3.44 to 4.19) | 3.10 (2.63 to 3.66) | 2.95 (2.68 to 3.25) |
| Trimester 1 | 3.42 (2.95 to 3.98) | 3.04 (2.58 to 3.56) | 1.46 (0.96 to 2.20) | 1.12 (0.86 to 1.45) |
| Trimester 2 | 4.31 (3.78 to 4.93) | 3.01 (2.56 to 3.53 | 1.82 (1.27 to 2.62) | 1.58 (1.24 to 1.99) |
| Trimester 3 | 7.14 (6.43 to 7.94) | 5.12 (4.53 to 5.80) | 5.69 (4.66 to 6.95) | 5.48 (4.89 to 6.12) |
| Around delivery | 37.5 (30.9 to 44.45) | 27.97 (22.24 to 35.17) | 44.5 (31.68 to 62.54) | – |
| Postpartum | 10.21 (9.27 to 11.25) | 8.72 (7.83 to 9.70) | 8.54 (7.16 to 10.19) | 4.85 (4.21 to 5.57) |
| Early postpartum | 19.27 (16.53 to 20.21) | 15.62 (14.00 to 17.45) | 14.61 (12.10 to 17.67) | 8.44 (7.27 to 9.75) |
| Late postpartum | 2.06 (1.60 to 2.64) | 1.69 (1.26 to 2.25) | 2.29 (1.44 to 3.65) | 0.89 (0.53 to 1.39) |
Early postpartum (first 6 weeks after delivery).
Late postpartum (6 weeks after delivery).
*Adjusted for age and calendar year.
†Unadjusted ratio calculated based on the data provided.
IRR, incidence rate ratios; VTE, venous thromboembolism.