Table 2.
Distribution of maternal characteristics across preterm birth status
| Preterm birth | Term birth |
p value |
|
| N (%) | N (%) | ||
| Maternal age | 0.332 | ||
| <35 years | 269 (77.1) | 3541 (79.3) | |
| ≥35 years | 80 (22.9) | 926 (20.7) | |
| Marital status | 0.657 | ||
| Single/divorced/separated | 17 (5.0) | 198 (4.4) | |
| Married/common-law | 326 (95.0) | 4260 (95.6) | |
| Ethnicity | 0.004 | ||
| White/Caucasian | 253 (73.8) | 3574 (80.3) | |
| Others | 90 (26.2) | 878 (19.7) | |
| Duration of stay in Canada | 0.061 | ||
| <5 years | 39 (11.6) | 380 (8.6) | |
| Born/5 years+ | 296 (88.4) | 4022 (91.4) | |
| Body mass index | 0.001 | ||
| Underweight (<18.5 kg/m2) | 12 (3.7) | 180 (4.2) | |
| Normal weight (18.5–24.99 kg/m2) | 183 (56.3) | 2694 (63.3) | |
| Overweight (25–29.99 kg/m2) | 72 (22.2) | 924 (21.7) | |
| Obesity (≥30 kg/m2) | 58 (17.9) | 459 (10.8) | |
| Parity | 0.004 | ||
| Primiparous | 201 (58.9) | 2266 (50.9) | |
| Multiparous | 140 (41.1) | 2184 (49.1) | |
| Unintended pregnancy | 62 (18.0) | 829 (18.6) | 0.798 |
| Smoked before pregnancy | 85 (24.7) | 913 (20.5) | 0.062 |
| Alcohol consumption before pregnancy | 295 (85.8) | 3770 (84.5) | 0.531 |
| Drug abuse before pregnancy | 54 (15.7) | 643 (14.4) | 0.519 |
| Maternal education | 0.891 | ||
| High school or less than high school | 40 (11.7) | 487 (11.0) | |
| Some post-secondary | 54 (15.8) | 729 (16.4) | |
| Completed post-secondary | 248 (72.5) | 3227 (72.6) | |
| Household income | 0.436 | ||
| <$40 000 | 34 (10.2) | 360 (8.2) | |
| $40 000–<$70 000 | 51 (15.2) | 591 (13.5) | |
| $70 000–<$100 000 | 74 (22.1) | 1059 (24.2) | |
| ≥$100 000 | 176 (52.5) | 2358 (54.0) | |
| Inadequate social support anytime during pregnancy | 84 (24.2) | 955 (21.4) | 0.216 |
| Neighbourhood deprivation index | 0.002 | ||
| Quintile 1 (least deprived) | 93 (26.1) | 1176 (27.7) | |
| Quintile 2 | 76 (21.4) | 1119 (26.3) | |
| Quintile 3 | 71 (19.9) | 839 (19.8) | |
| Quintile 4 | 52 (14.6) | 639 (15.0) | |
| Quintile 5 (most deprived) | 64 (18.0) | 475 (11.2) |
Sample size between variables differs as missing values were deleted using variable wise or pair wise deletion approach.