Absolute rate of first VTE per 100 000 person-years in and around pregnancy and outside pregnancy
| Time period | VTE definition A (using any code for VTE regardless of confirmation) | VTE definition B (using only algorithm-confirmed VTE) | English data5 | Danish data13 | ||||
|---|---|---|---|---|---|---|---|---|
| N | Rate (95% CI) | N | Rate (95% CI) | N | Rate | N | Rate | |
| Outside pregnancy | 1105 | 42 (40 to 44) | 1015 | 38 | 1480 | 32 (30–33) | 2895 | 36 (34–37) |
| Antepartum | 995 | 205 (192 to 218) | 690 | 142 (132 to 153) | 156 | 99 (85–116) | 491 | 107 (97–116) |
| Trimester 1 | 207 | 136 (118 to 155) | 172 | 113 (97 to 131) | 23 | 46 (31–70) | 61 | 41 (32–52) |
| Trimester 2 | 275 | 174 (154 to 196) | 178 | 112 (97 to 130) | 30 | 58 (41–83) | 75 | 57 (46–72) |
| Trimester 3 | 513 | 292 (268 to 319) | 340 | 194 (174 to 216) | 103 | 182 (150–221) | 355 | 197 (177–219) |
| Around delivery | 115 | 1546 (1288 to 1856) | 79 | 1061 (851 to 1323) | 34 | 1428 (1020–1998) | – | |
| Postpartum | 649 | 423 (392 to 457) | 509 | 331 (304 to 361) | 135 | 274 (231–324) | 218 | 175 (153–200) |
| Early postpartum | 584 | 754 (696 to 818) | 460 | 593 (541 to 650) | 177 | 468 (391–561) | 199 | 304 (264–350) |
| Late postpartum | 65 | 85 (70 to 109) | 49 | 64 (49 to 85) | 18 | 73 (46–116) | 319 | 32 (19–50) |
Early postpartum (first 6 weeks after delivery).
Late postpartum (6 weeks after delivery).
VTE, venous thromboembolism.