Table 1.
Population and initial variables in the design of the postpartum hemorrhage calculator.
| Number of Participants by Category | Percentage |
Relative Provability |
|||||
|---|---|---|---|---|---|---|---|
| No Hemorrhage |
Hemorrhage |
No Hemorrhage π1 |
Hemorrhage π2 |
||||
| N° | % | N° | % | ||||
| Age of mother | Less than 25 years old | 15 | 1.00% | 4 | 0.27% | 0.0140 | 0.0094 |
| Between 25 and 35 years old | 556 | 37.07% | 218 | 14.53% | 0.5177 | 0.5117 | |
| Between 35 and 40 years old | 400 | 26.67% | 156 | 10.40% | 0.3724 | 0.3662 | |
| More than 40 years | 103 | 6.87% | 48 | 3.20% | 0.0959 | 0.1127 | |
| 1500 | TOTAL | 1074 | 71.60% | 426 | 28.40% | ||
| Weeks of gestation | Less than 35 weeks | 8 | 0.54% | 0 | 0.00% | 0.0075 | 0.0000 |
| Between 35 and 40 weeks | 179 | 12.05% | 101 | 6.80% | 0.1684 | 0.2388 | |
| More than 40 weeks | 876 | 58.95% | 322 | 21.67% | 0.8241 | 0.7612 | |
| 1486 | TOTAL | 1063 | 71.53% | 423 | 28.47% | ||
| Hypertensive condition | No High blood pressure | 1041 | 69.40% | 403 | 26.87% | 0.9693 | 0.9460 |
| Chronic hypertension | 7 | 0.47% | 3 | 0.20% | 0.0065 | 0.0070 | |
| Gestational hypertension | 26 | 1.73% | 20 | 1.33% | 0.0242 | 0.0469 | |
| 1500 | TOTAL | 1074 | 71.60% | 426 | 28.40% | ||
| Preeclamspsia | No | 1053 | 70.20% | 406 | 27.07% | 0.9804 | 0.9531 |
| Mild | 14 | 0.93% | 10 | 0.67% | 0.0130 | 0.0235 | |
| Severe | 7 | 0.47% | 10 | 0.67% | 0.0065 | 0.0235 | |
| 1500 | TOTAL | 1074 | 71.60% | 426 | 28.40% | ||
| Eclamspsia | No | 1074 | 71.60% | 425 | 28.33% | 1.0000 | 0.9977 |
| Yes | 0 | 0.00% | 1 | 0.07% | 0.0023 | ||
| 1500 | TOTAL | 1074 | 71.60% | 426 | 28.40% | 0.0000 | |
| HELLP Syndrome | No | 1071 | 71.40% | 421 | 28.07% | 0.9972 | 0.9883 |
| Yes | 3 | 0.20% | 5 | 0.33% | 0.0028 | 0.0117 | |
| 1500 | TOTAL | 1074 | 71.60% | 426 | 28.40% | ||
| Smoking habit | No | 927 | 62.13% | 369 | 24.73% | 0.8696 | 0.8662 |
| Yes, before pregnancy | 58 | 3.89% | 33 | 2.21% | 0.0544 | 0.0775 | |
| Yes, during gestation | 81 | 5.43% | 24 | 1.61% | 0.0760 | 0.0563 | |
| 1492 | TOTAL | 1066 | 71.45% | 426 | 28.55% | ||
| Diabetes | No | 1025 | 68.3% | 406 | 27.07% | 0.9544 | 0.9531 |
| Pre-gestational | 7 | 0.47% | 7 | 0.47% | 0.0065 | 0.0164 | |
| Gestational diabetes | 42 | 2.80% | 13 | 0.87% | 0.0391 | 0.0305 | |
| 1500 | TOTAL | 1074 | 71.60% | 426 | 28.40% | ||
| Anti-phospholipid syndrome | No | 1071 | 71.40% | 424 | 28.27% | 0.9972 | 0.9953 |
| Yes | 3 | 0.20% | 2 | 0.13% | 0.0028 | 0.0047 | |
| 1500 | TOTAL | 1074 | 71.60% | 426 | 28.40% | ||
| Pro-thrombotic condition | No | 1060 | 70.67% | 418 | 27.87% | 0.9870 | 0.9812 |
| Yes, but asymptomatic | 10 | 0.67% | 6 | 0.40% | 0.0093 | 0.0141 | |
| Yes, with a history of thrombosis | 0 | 0.27% | 2 | 0.13% | 0.0037 | 0.0047 | |
| 1500 | TOTAL | 1070 | 71.60% | 426 | 28.40% | ||
| Use of Heparin during Pregnancy | No | 1045 | 69.67% | 406 | 27.07% | 0.9730 | 0.9531 |
| yes | 29 | 1.93% | 20 | 1.33% | 0.0270 | 0.0469 | |
| 1500 | TOTAL | 1074 | 71.60% | 426 | 28.40% | ||
| Pre-pregnancy abortion | No | 772 | 51.81% | 296 | 19.87% | 0.7242 | 0.7064 |
| 1 previous abortion | 294 | 19.73% | 123 | 8.26% | 0.2758 | 0.2936 | |
| 2 or more previous abortions | 3 | 0.20% | 2 | 0.13% | 0.0028 | 0.0048 | |
| 1490 | TOTAL | 1069 | 71.74% | 421 | 28.26% | ||
| Number of fetuses | Single fetus | 1050 | 70.19% | 412 | 27.54% | 0.9804 | 0.9694 |
| Multiple gestation | 21 | 1.40% | 13 | 0.87% | 0.0196 | 0.0306 | |
| 1496 | TOTAL | 1071 | 71.59% | 425 | 28.41% | ||
| Amniotic fluid amount | Oligohydramnios | 25 | 1.67% | 7 | 0.47% | 0.0233 | 0.0164 |
| Normal amount | 1044 | 69.60% | 415 | 27.67% | 0.9721 | 0.9742 | |
| Polihydramnios | 5 | 0.33% | 4 | 0.27% | 0.0047 | 0.0094 | |
| 1500 | TOTAL | 1074 | 71.60% | 426 | 28.40% | ||
| Parity | No previous deliveries | 600 | 40.13% | 221 | 14.78% | 0.5607 | 0.5200 |
| 1 previous delivery | 382 | 25.55% | 175 | 11.71% | 0.3570 | 0.4118 | |
| More than 1 previous delivery | 88 | 5.89% | 29 | 1.94% | 0.0822 | 0.0682 | |
| 1495 | TOTAL | 1070 | 71.57% | 425 | 28.43% | 0.8937 | 0.8803 |
| Previous cesarean section | No | 958 | 63.95% | 375 | 25.03% | 0.1063 | 0.1197 |
| 1 previous cesarean section | 114 | 7.61% | 51 | 3.40% | 0.0000 | 0.0000 | |
| More than 1 previous cesarean | 0 | 0.00% | 0 | 0.00% | |||
| 1498 | TOTAL | 1072 | 71.56% | 426 | 28.44% | ||
| Estimated fetal weight in third trimester, gram (g) | Less than 2500 g | 78 | 5.23% | 27 | 1.81% | 0.0733 | 0.0634 |
| Between 2500 g and 3800 g | 875 | 58.72% | 351 | 23.56% | 0.8224 | 0.8239 | |
| Equal to or more than 3800 g | 111 | 7.45% | 48 | 3.22% | 0.1043 | 0.1127 | |
| 1490 | TOTAL | 1064 | 71.41% | 426 | 28.59% | ||
| Labor hours | Less than 1 h | 52 | 4.11% | 27 | 2.14% | 0.0579 | 0.0738 |
| More than 1 h and less than 5 h | 435 | 34.41% | 141 | 11.16% | 0.4844 | 0.3852 | |
| Between 5 and 10 h | 313 | 24.76% | 140 | 11.08% | 0.3486 | 0.3825 | |
| More than 10 h | 98 | 7.75% | 58 | 4.59% | 0.1091 | 0.1585 | |
| 1264 | TOTAL | 898 | 71.04% | 366 | 28.96% | ||
| Body mass index (BMI) | BMI < 30 | 616 | 54.85% | 292 | 26.00% | 0.7990 | 0.8295 |
| BMI > or = 30 | 155 | 13.80% | 60 | 5.34% | 0.2010 | 0.1705 | |
| 1123 | TOTAL | 771 | 68.66% | 352 | 31.34% | ||
| Uterine fibroids | No | 187 | 54.36% | 147 | 42.73% | 0.9740 | 0.9671 |
| Yes | 5 | 1.45% | 5 | 1.45% | 0.0260 | 0.0329 | |
| 344 | TOTAL | 192 | 55.81% | 152 | 44.19% | ||
| Placenta previa | No | 192 | 55.01% | 148 | 42.41% | 0.9897 | 0.9548 |
| Yes | 2 | 0.57% | 7 | 2.01% | 0.0103 | 0.0452 | |
| 349 | TOTAL | 194 | 55.59% | 155 | 44.41% | ||
| History of postpartum hemorrhage | No | 147 | 52.69% | 130 | 46.59% | 1.0000 | 0.9848 |
| Yes | 0 | 0.00% | 2 | 0.72% | 0.0000 | 0.0152 | |
| 279 | TOTAL | 147 | 52.69% | 132 | 47.31% | ||
| Anemia | No | 136 | 48.75% | 116 | 41.58% | 0.9252 | 0.8788 |
| Yes | 11 | 3.94% | 16 | 5.73% | 0.0748 | 0.1212 | |
| 279 | TOTAL | 147 | 52.69% | 132 | 47.31% | ||
π1: probability assigned by the algorithm for no postpartum hemorrhage, π2: probability assigned by the algorithm for postpartum hemorrhage.