Characteristics of 1 023 978 women who delivered singleton liveborn infants in Ontario between 2002 and 2010, by intensive care unit (ICU) state*
| Characteristic† | ICU state;* no. (%) of women† | |||
|---|---|---|---|---|
| Co-ICU n = 1 216 | Maternal ICU n = 897 | NICU n = 123 236 | No ICU n = 898 629 | |
| Age, yr, mean ± SD | 31.2 ± 6.2 | 30.9 ± 5.9 | 29.8 ± 5.8 | 29.8 ± 5.5 |
| Nulliparous | 649 (53.4) | 524 (58.4) | 65 445 (53.1) | 397 317 (44.2) |
| Income quintile | ||||
| 1 (lowest) | 348 (28.6) | 215 (24.0) | 32 769 (26.6) | 197 232 (21.9) |
| 2 | 270 (22.2) | 206 (23.0) | 26 135 (21.2) | 178 178 (19.8) |
| 3 | 235 (19.3) | 168 (18.7) | 25 060 (20.3) | 181 812 (20.2) |
| 4 | 224 (18.4) | 178 (19.8) | 22 367 (18.1) | 185 535 (20.6) |
| 5 (highest) | 136 (11.2) | 125 (13.9) | 16 564 (13.4) | 151 877 (16.9) |
| Urban residence | 1 120 (92.1) | 774 (86.3) | 114 140 (92.6) | 801 946 (89.2) |
| Tobacco or other drug dependence | 12 (1.0) | ≤ 5 | 1 070 (0.9) | 1 328 (0.1) |
| Diabetes mellitus | 47 (3.9) | 20 (2.2) | 4 872 (4.0) | 13 643 (1.5) |
| Chronic hypertension | ≤ 5 | ≤ 5 | 81 (0.1) | 275 (0.03) |
| Hospital admission in the year before the index admission | 319 (26.2) | 136 (15.2) | 17 733 (14.4) | 67 017 (7.5) |
| Gestational age at delivery, wk, mean ± SD | 35.4 ± 4.0 | 38.1 ± 2.6 | 37.4 ± 3.2 | 39.2 ± 1.4 |
| Term delivery (gestation ≥ 37 wk) | 558 (45.9) | 741 (82.6) | 87 798 (71.2) | 871 155 (96.9) |
| Invasive ventilation of any duration | ||||
| Mother | 219 (18.0) | 129 (14.4) | 31 (0.03) | 27 (< 0.01) |
| Newborn | 335 (27.5) | 75 (8.4) | 19 119 (15.5) | 9 518 (1.1) |
| Length of hospital stay, d, mean ± SD | ||||
| Mother | 9.9 ± 13.8 | 7.2 ± 10.8 | 3.7 ± 4.1 | 2.3 ± 1.6 |
| Newborn | 14.4 ± 20.2 | 5.8 ± 6.1 | 6.8 ± 12.1 | 2.0 ± 1.4 |
Note: SD = standard deviation.
↵* Co-ICU = both mother and newborn admitted to ICUs during index hospital admission; maternal ICU = only mother admitted to ICU; NICU = only newborn admitted to ICU; no ICU = neither mother nor newborn admitted to an ICU.
↵† Unless stated otherwise, all data refer to the number (%) of mothers and to the hospital admission for the index delivery.