Table 1 Characteristics of index infants and their mothers, Texas 2006–2012
From: Interpregnancy change in body mass index and infant outcomes in Texas: a population-based study
| Â | Na (%) or Mean (SD) | |||
|---|---|---|---|---|
All Infants (N = 2481) | LGA (N = 240) | SGA (N = 199) | PTB (N = 255) | |
Mean gestational age (weeks) | 38.3 (1.8) | 38.0 (2.0) | 38.5 (1.6) | 34.5 (2.4) |
Sex | ||||
 Male | 1239 (49.9) | 129 (53.8) | 99 (49.8) | 115 (45.1) |
 Female | 1242 (50.1) | 111 (46.3) | 100 (50.3) | 140 (54.9) |
Birth order | ||||
 2 | 1176 (48.4) | 95 (40.6) | 95 (47.7) | 102 (41.5) |
  > 2 | 1255 (51.6) | 139 (59.4) | 104 (52.3) | 144 (58.5) |
Payment method | ||||
 Private insurance | 852 (34.4) | 95 (39.8) | 53 (26.6) | 72 (28.2) |
 Medicaid | 1229 (49.6) | 99 (41.4) | 115 (57.8) | 143 (56.1) |
 Self-pay | 229 (9.2) | 24 (10.0) | 17 (8.5) | 19 (7.5) |
 Other | 169 (6.8) | 21 (8.8) | 14 (7.0) | 21 (8.2) |
Maternal race/ethnicity | ||||
 Non-Hispanic White | 812 (32.7) | 94 (39.2) | 49 (24.6) | 82 (32.2) |
 Hispanic | 1279 (51.6) | 131 (54.6) | 98 (49.3) | 124 (48.6) |
 Non-Hispanic Black | 277 (11.2) | NR | 39 (19.6) | 42 (16.5) |
 Other | 113 (4.6) | NR | 13 (6.5) | 7 (2.8) |
Age (years) | ||||
  < 20 | 163 (6.6) | 15 (6.3) | 14 (7.0) | 21 (8.2) |
 20–24 | 690 (27.8) | 43 (17.9) | 63 (31.7) | 86 (33.7) |
 25–29 | 758 (30.6) | 84 (35.0) | 72 (36.2) | 62 (24.3) |
 30–34 | 581 (23.4) | 60 (25.0) | 34 (17.1) | 63 (24.7) |
  ≥ 35 | 289 (11.7) | 38 (15.8) | 16 (8.0) | 23 (9.0) |
Marital status | ||||
 Married | 1526 (61.5) | 165 (68.8) | 109 (54.8) | 144 (56.5) |
 Not married | 955 (38.5) | 75 (31.3) | 90 (45.2) | 111 (43.5) |
Education | ||||
  < High school | 666 (26.9) | 68 (28.3) | 64 (32.2) | 72 (28.2) |
 High school | 683 (27.5) | 68 (28.3) | 61 (30.7) | 82 (32.2) |
  > High school | 1131 (45.6) | 104 (43.3) | 74 (37.2) | 101 (39.6) |
Smokingb | ||||
 Yes | 153 (6.2) | 11 (4.6) | 17 (8.5) | 21 (8.3) |
 No | 2326 (93.8) | 229 (95.4) | 182 (91.5) | 233 (91.7) |
Hypertensionc | ||||
 Yes | 105 (4.2) | 13 (5.4) | 10 (5.0) | 23 (9.0) |
 No | 2372 (95.8) | 227 (94.6) | 189 (95.0) | 232 (91.0) |
Mean interpregnancy interval (months) | 21.4 (15.1) | 22.1 (15.0) | 19.6 (14.4) | 19.6 (14.9) |
Interpregnancy interval (months) | ||||
  < 6 | 318 (12.8) | 25 (10.4) | 35 (17.6) | 46 (18.0) |
 6 to < 12 | 474 (19.1) | 40 (16.7) | 40 (20.1) | 52 (20.4) |
 12 to < 18 | 452 (18.2) | 50 (20.8) | 35 (17.6) | 40 (15.7) |
  ≥ 18 | 1237 (49.9) | 125 (52.1) | 89 (44.7) | 117 (45.9) |
Gestational weight gaind | ||||
 Inadequate | 596 (24.1) | 32 (13.3) | 69 (34.7) | 88 (34.5) |
 Adequate | 841 (34.0) | 78 (32.5) | 73 (36.7) | 96 (37.7) |
 Excessive | 1040 (42.0) | 130 (54.2) | 57 (28.6) | 71 (27.8) |
Height (m) | ||||
  < 1.60 | 1038 (41.8) | 80 (33.3) | 88 (44.2) | 117 (45.9) |
 1.60 to < 1.65 | 699 (28.2) | 58 (24.2) | 66 (33.2) | 68 (26.7) |
 1.65 to < 1.70 | 434 (17.5) | 54 (22.5) | 32 (16.1) | 42 (16.5) |
  ≥ 1.70 | 310 (12.5) | 48 (20.0) | 13 (6.5) | 28 (11.0) |
Mean prepregnancy BMI - sibling pregnancy (kg/m2) | 25.6 (5.8) | 27.7 (6.2) | 25.4 (5.7) | 25.2 (5.8) |
Prepregnancy BMI - sibling pregnancy (kg/m2) | ||||
 Underweight (< 18.5) | 99 (4.0) | NR | 10 (5.0) | 16 (6.3) |
 Normal (18.5–24.9) | 1304 (52.6) | 97 (40.4) | 101 (50.8) | 135 (52.9) |
 Overweight (25.0–29.9) | 618 (24.9) | NR | 50 (25.1) | 54 (21.2) |
 Obese (≥30.0) | 460 (18.5) | 72 (30.0) | 38 (19.1) | 50 (19.6) |
Mean prepregnancy BMI - index pregnancy (kg/m2) | 26.7 (6.3) | 28.9 (6.7) | 26.3 (6.1) | 26.2 (6.6) |
Prepregnancy BMI - index pregnancy (kg/m2) | ||||
 Underweight (< 18.5) | 64 (2.6) | NR | NR | 9 (3.5) |
 Normal (18.5–24.9) | 1135 (45.8) | 80 (33.3) | 99 (49.8) | 131 (51.4) |
 Overweight (25.0–29.9) | 676 (27.3) | NR | NR | 56 (22.0) |
 Obese (≥30.0) | 606 (24.4) | 85 (35.4) | 47 (23.6) | 59 (23.1) |
Mean interpregnancy change in BMI (kg/m2) | 1.1 (3.3) | 1.2 (3.7) | 0.8 (3.6) | 1.0 (3.7) |
Interpregnancy change in BMI (kg/m2) | ||||
  < −1 | 430 (17.3) | 38 (15.8) | 45 (22.6) | 64 (25.1) |
  < −1 to < 0 | 305 (12.3) | 24 (10.0) | 26 (13.1) | 33 (12.9) |
 0 to < 1 | 677 (27.3) | 64 (26.7) | 41 (20.6) | 60 (23.5) |
 1 to < 2 | 319 (12.9) | 37 (15.4) | 27 (13.6) | 35 (13.7) |
 2 to < 3 | 224 (9.0) | 31 (12.9) | 24 (12.1) | 16 (6.3) |
  ≥ 3 | 526 (21.2) | 46 (19.2) | 36 (18.1) | 47 (18.4) |