Table 1. Baseline characteristics of study participants by birth weight categories.
| Characteristic | Total | Low birth weight | Normal birth weight | Macrosomia | P a |
| Number of participants | 279743 | 28601 | 213988 | 37154 | |
| Age/yr., mean (SD) | 55.2 (8.1) | 56.4 (8.0) | 54.9 (8.1) | 56.1 (8.2) | < 0.001 |
| Sex/case (%) | < 0.001 | ||||
| Male | 109016 (39.0) | 8215 (29.1) | 81321 (38.0) | 19480 (52.4) | |
| Female | 170727 (61.0) | 20386 (70.9) | 132667 (62.0) | 17674 (47.6) | |
| Ethnicity/case (%) | < 0.001 | ||||
| Non-white | 7066 (2.5) | 1004 (3.5) | 5363 (2.5) | 699 (1.9%) | |
| White | 272677 (97.5) | 27597 (96.5) | 208625 (97.5) | 36455 (98.1) | |
| Educational attainment/case (%) | < 0.001 | ||||
| High | 177628 (63.5) | 16520 (57.8) | 137882 (64.4) | 23226 (62.5) | |
| Low | 102115 (36.5) | 12081 (42.2) | 76106 (35.6) | 13928 (37.5) | |
| Average total household income/case (%) | < 0.001 | ||||
| < ￡18000 | 56186 (20.1) | 7222 (25.3) | 41271 (19.3) | 7693 (20.7) | |
| ￡18000-￡30999 | 68073 (24.3) | 7627 (26.7) | 51282 (24.0) | 9164 (24.7) | |
| ￡31000-￡51999 | 76395 (27.3) | 7265 (25.4) | 59249 (27.7) | 9881 (26.6) | |
| ≥ ￡52000 | 79089 (28.3) | 6487 (22.7) | 62186 (29.1) | 10416 (28.0) | |
| (The table continues on the next page.) | |||||