Table 3.
Frequency, case fatality, and length of hospital stay (LOS) for composite severe maternal morbidity (SMM) and SMM types under the 2018 SMM definition, Canada (excluding Quebec), 2012‐2016
| SMM type | Frequency | Case fatality | Length of stay | |||
|---|---|---|---|---|---|---|
| Number of cases | Rate per 100 000 (95% CI) | Number of deaths | Rate per 1000* (95% CI) | Median (days) | % with LOS ≥ 7 days | |
| All deliveries | 1 418 545 | ‐ | 51 | 0.04 (0.03, 0.05) | 2.0 | 1.5 |
| Any SMM | 22 799 | 1607.2 (1586.6, 1628.0) | 46 | 2.0 (1.5, 2.7) | 4.0 | 18.8 |
| No SMM | 1 395 746 | 98 392.8 (98 3372.0, 98 413.4) | 5 | 0.004 (0.001, 0.009) | 2.0 | 1.3 |
| Maternal ICU admission | 2729 | 192.4 (185.2, 199.8) | 24 | 8.8 (5.9, 13.1) | 5.0 | 36.9 |
| Severe pre‐eclampsia, HELLP, eclampsia | 7923 | 558.5 (546.4, 570.9) | <5 | 0.13, 0.50* | 5.0 | 26.2 |
| Severe haemorrhage | 7085 | 499.5 (487.9, 511.2) | 19 | 2.7 (1.7, 4.2) | 3.0 | 14.2 |
| Severe uterine rupture | 204 | 14.4 (12.5, 16.5) | <5 | 4.9, 19.6* | 5.0 | 27.5 |
| Hysterectomy | 2109 | 148.7 (142.4, 155.2) | 6 | 2.8 (1.3, 6.1) | 3.0 | 22.6 |
| Sepsis | 1296 | 91.4 (86.5, 96.5) | <5 | 0.77, 3.09* | 4.0 | 26.1 |
| Embolism, shock, or DIC | 973 | 68.6 (64.3, 73.0) | 19 | 19.5 (12.5, 30.3) | 4.0 | 28.2 |
| ARF or dialysis | 647 | 45.6 (42.2, 49.3) | 9 | 13.9 (7.3, 26.2) | 7.0 | 53.0 |
| Cardiac conditions | 887 | 62.5 (58.5, 66.8) | 36 | 40.6 (29.5, 55.7) | 5.0 | 34.9 |
| Cerebrovascular accidents | 136 | 9.6 (8.1, 11.4) | 5 | 36.8 (15.8, 83.2) | 3.0 | 27.9 |
| Surgical complications | 2752 | 194.0 (186.8, 201.4) | 18 | 6.5 (4.1, 10.3) | 3.0 | 13.1 |
| Assisted ventilation | 940 | 66.3 (62.1, 70.6) | 29 | 30.9 (21.6, 44.0) | 6.0 | 47.8 |
Abbreviations: CI, confidence interval; ICU, intensive care unit; DIC, disseminated intravascular coagulation; ARF, acute renal failure.
*
If the numerator of the rate was >0 and <5, a range was provided (assuming a numerator of 1 and 4) instead of actual value (95% confidence interval not provided).