Table 1 Maternal and infant characteristics from birth records of preterm and full-term singleton births in Kansas with an estimated date of conception from January 1st, 2000, to December 31st, 2015.
Maternal/infant characteristics | Preterm birth (N = 41,936) | Full-term birth (N = 554,990) | Total (N = 596,926) |
|---|---|---|---|
Birth weight (g) | |||
Mean (SD) | 2499.5 (644.6) | 3410.9 (458.5) | 3346.9 (528.1) |
Gestational diabetes | |||
Yes | 2095 (5.0) | 18,360 (3.3) | 20,455 (3.4) |
No | 29,584 (70.5) | 403,017 (72.6) | 432,601 (72.5) |
Missing | 10,257 (24.5) | 133,613 (24.1) | 143,870 (24.1) |
Chronic diabetes | |||
Yes | 720 (1.7) | 2466 (0.4) | 3186 (0.5) |
No | 30,959 (73.8) | 418,912 (75.5) | 449,871 (75.4) |
Missing | 10,257 (24.5) | 133,612 (24.1) | 143,869 (24.1) |
Gestational hypertension | |||
Yes | 5,024 (12.0) | 19,234 (3.5) | 24,258 (4.1) |
No | 36,907 (88.0) | 535,695 (96.5) | 572,602 (95.9) |
Missing | 5 (0.0) | 61 (0.0) | 66 (0.0) |
Chronic hypertension | |||
Yes | 1127 (2.7) | 5159 (0.9) | 6286 (1.1) |
No | 40,804 (97.3) | 549,770 (99.1) | 590,574 (98.9) |
Missing | 5 (0.0) | 61 (0.0) | 66 (0.0) |
Gestational age (weeks) | |||
Mean (SD) | 34.5 (2.1) | 39.1 (1.1) | 38.76 (1.66) |
Maternal education level | |||
< High School | 8114 (19.5) | 91,530 (16.6) | 99,644 (16.8) |
High School/GED | 11,659 (28.0) | 136,321 (24.7) | 147,980 (24.9) |
Some College/AA | 12,023 (28.8) | 159,097 (28.8) | 171,120 (28.8) |
BA+ | 9890 (23.7) | 165,201 (29.9) | 175,091 (29.5) |
Maternal ethnicity | |||
Hispanic | 11,471 (27.5) | 137,984 (25.0) | 149,455 (25.1) |
Non-Hispanic | 30,465 (72.5) | 417,006 (75.0) | 447,471 (74.9) |
Maternal age (years) | |||
Mean (SD) | 26.9 (6.1) | 27.0 (5.8) | 27.0 (5.8) |
Maternal marital status | |||
Married | 18,186 (43.4) | 268,924 (48.5) | 287,110 (48.1) |
Unmarried | 13,458 (32.1) | 152,167 (27.4) | 165,625 (27.7) |
Missing | 10,292 (24.5) | 133,899 (24.1) | 144,191 (24.2) |
Parity | |||
1 | 11,650 (45.8) | 175,844 (50.7) | 187,494 (50.3) |
2 | 7293 (28.7) | 100,957 (29.1) | 108,250 (29.1) |
≥ 3 | 6507 (25.6) | 70,325 (20.3) | 76,832 (20.6) |
Smoking during pregnancy | |||
Yes | 5094 (12.1) | 48,670 (8.8) | 53,764 (9.0) |
No | 36,842 (87.9) | 506,320 (91.2) | 543,162 (91.0) |
Conception season | |||
Winter | 10,425 (24.9) | 137,994 (24.9) | 148,419 (24.9) |
Spring | 10,548 (25.2) | 136,057 (24.5) | 146,605 (24.6) |
Summer | 10,450 (24.9) | 137,268 (24.7) | 147,718 (24.7) |
Autumn | 10,513 (25.1) | 143,671 (25.9) | 154,184 (25.8) |
Zip code level percent below poverty | |||
Mean (SD) | 13.0% (7.0%) | 12.0% (7.0%) | 12.0% (7.0%) |
Census tract level percentage of greenspace | |||
Mean (SD) | 58.0 (33.7) | 57.7 (33.5) | 57.7 (33.5) |
