Characteristics of mothers and infants according to late-preterm and term status
| Late-preterm infants (33–36 weeks) | Term infants (≥37 weeks) | ||
|---|---|---|---|
| Number of women | 2051 (5.7) | 33 682 (94.3) | |
| Number of live births | 2176 (6.0) | 33 879 (93.9) | |
| Gender of baby | |||
| Male | 1153 (52.9) | 17 250 (50.9) | 0.061 |
| Female | 1023 (47.0) | 16 628 (49.1) | |
| Birth weight (g) | |||
| <1000 | 3 (0.1) | 8 (0.02) | <0.001 |
| 1000–1999 | 261 (11.9) | 98 (0.3) | |
| 2000–2999 | 1488 (68.4) | 6397 (18.9) | |
| 3000–3999 | 403 (18.5) | 23 810 (70.3) | |
| ≥4000 | 21 (0.9) | 3566 (10.5) | |
| Type of birth | |||
| Singleton babies | 1929 (88.7) | 33 498 (98.9) | <0.001 |
| Multiple babies | 247 (11.4) | 381 (1.1) | |
| Maternal age at conception | |||
| ≤18 years | 87 (4.0) | 1190 (3.5) | <0.001 |
| 19–25 years | 852 (39.2) | 12 633 (37.3) | |
| 26–34 years | 928 (42.7) | 15 935 (47.0) | |
| ≥35 years | 309 (14.2) | 4121 (12.2) | |
| Maternal living arrangement | |||
| Living alone | 431 (19.8) | 5150 (15.2) | <0.001 |
| Maternal education completed | |||
| Secondary education not completed | 596 (27.4) | 7875 (23.2) | <0.001 |
| Secondary education (Grade 11) | 351 (16.1) | 5432 (16.0) | |
| Postsecondary college | 1022 (46.9) | 15 951 (47.1) | |
| Tertiary education | 207 (9.5) | 4621 (13.6) | |
| Maternal insurance status | |||
| Welfare beneficiary | 935 (42.9) | 11 745 (34.7) | <0.001 |
| Maternal region of residence | |||
| Rural | 517 (23.8) | 8355 (24.7) | 0.34 |
| Maternal comorbidities | |||
| Asthma* | 549 (25.2) | 7734 (22.8) | 0.01 |
| Diabetes† | 152 (6.9) | 1438 (4.2) | <0.001 |
| Gestational hypertension‡ | 279 (12.8) | 1706 (5.0) | <0.001 |
Values represent the number (percentage).
↵* Asthma defined by the presence of ICD-9 codes 493.
↵† Diabetes defined by the presence of ICD-9 codes 250, 271.4, 648.0, 648.8 and 790.2.
‡ Gestational hypertension and pre-eclampsia defined by the presence of ICD-9 codes 642 recorded at ≥20 weeks gestation.
ICD, International Classification of Diseases.