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Table 1 Maternal and birth characteristics of newborns classified as SGA, AGA, or LGA by customized and population birth weight classifications

From: Customized versus population birth weight charts for identification of newborns at risk of long-term adverse cardio-metabolic and respiratory outcomes: a population-based prospective cohort study

  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)
  1. Values are median (95% range), mean (SD), and absolute numbers (%)
  2. SD standard deviation
  3. aSGA was defined as gestational age-adjusted birth weight < 10th percentile of the customized chart. AGA is defined as gestational age-adjusted birth weight > 10th and < 90th percentile according to the customized chart. LGA was defined as gestational age-adjusted birth weight > 90th percentile of the customized chart
  4. bSGA was defined as gestational age-adjusted birth weight < 10th percentile of the population chart. AGA is defined as gestational age-adjusted birth weight > 10th and < 90th percentile of the population chart. LGA was defined as gestational age-adjusted birth weight > 90th percentile of the population chart