Table 1 Maternal and birth characteristics of newborns classified as SGA, AGA, or LGA by customized and population birth weight classifications
| Â | Customized classificationa | Population classificationb | ||||
|---|---|---|---|---|---|---|
Small size for gestational age | Appropriate size for gestational age | Large size for gestational age | Small size for gestational age | Appropriate size for gestational age | Large size for gestational age | |
n = 605 | n = 4842 | n = 605 | n = 605 | n = 4842 | n = 605 | |
Maternal characteristics | ||||||
 Age, median (95% range), years | 30.5 (19.7 to 39.8) | 30.6 (19.6 to 39.1) | 30.7 (20.1 to 39.3) | 29.7 (19.0 to 39.6) | 30.5 (19.8 to 39.0) | 31.6 (21.5 to 39.8) |
 Height, mean (SD) (cm) | 166.2 (7.4) | 167.7 (7.4) | 169.3 (7.3) | 164.3 (7.1) | 167.7 (7.3) | 170.6 (7.2) |
 Weight, mean (SD) (kg) | 71.8 (16.3) | 68.7 (12.3) | 70.4 (12.9) | 64.8 (12.5) | 68.8 (12.4) | 76.0 (14.6) |
 Body mass index, mean (SD) (kg/m2) | 26 (5.6) | 24.4 (4.1) | 24.6 (4.4) | 24.0 (4.4) | 24.5 (4.2) | 26.2 (5.1) |
 Obesity | 123 (20.3) | 485 (10.0) | 60 (9.9) | 58 (9.6) | 491 (10.1) | 119 (19.7) |
 Education, no. higher (%) | 217 (37) | 2137 (45) | 306 (52) | 206 (34.8) | 2141 (45.2) | 313 (52.8) |
 Ethnicity, no. (%) Dutch/European | 332 (54.9) | 2899 (59.9) | 395 (65.3) | 283 (46.8) | 2911 (60.1) | 432 (71.4) |
 Parity, no. Nulliparous (%) | 348 (57.5) | 2792 (57.7) | 330 (54.5) | 434 (71.7) | 2787 (57.6) | 249 (41.2) |
 Smoking, no. (%) | ||||||
  None | 440 (66.3) | 3755 (73.9) | 510 (79.6) | 379 (65.2) | 3466 (74.4) | 462 (79.4) |
  Early pregnancy only | 50 (7.5) | 453 (8.9) | 61 (9.5) | 45 (7.7) | 418 (9.0) | 55 (9.5) |
  Continued | 174 (26.2) | 875 (17.2) | 70 (10.9) | 157 (27.0) | 773 (16.6) | 65 (11.2) |
Birth characteristics | ||||||
 Males, no. (%) | 295 (42.8) | 2665 (50.5) | 390 (59.2) | 242 (40.0) | 2435 (50.3) | 362 (59.8) |
 Gestational age, median (95% range) weeks | 39.7 (32.0 to 42.3) | 40.3 (36.3 to 42.3) | 39.9 (36.2 to 42.1) | 40.3 (36.3 to 42.4) | 40.3 (36.3 to 42.4) | 39.9 (36.0 to 42.0) |
 Birth weight, mean (SD) grams | 2622 (483) | 3440 (425) | 4176 (396) | 2581 (421) | 3442 (416) | 4230 (399) |
 Preterm birth, no. (%) | 74 (12.2) | 184 (3.8) | 21 (3.5) | 66 (10.9) | 187 (3.9) | 26 (4.3) |
 Cesarean delivery, no. (%) | 107 (18.9) | 467 (10.5) | 94 (17.1) | 102 (18.2) | 478 (10.8) | 88 (16.0) |
 Assisted delivery, no. (%) | 75 (13.3) | 644 (14.5) | 75 (13.6) | 59 (15.9) | 651 (14.7) | 54 (9.9) |
 APGAR score below 7 at 5 min, no. (%) | 16 (2.8) | 40 (0.9) | 4 (0.9) | 12 (2.1) | 44 (0.9) | 5 (0.9) |