Table 1 Maternal and fetal characteristics of infants with large and average fetal head circumference, Washington State, 2003 – 2009
Large FHC [≥37 cm] | Average FHC [34 cm] | |||
|---|---|---|---|---|
(N = 10,750) | (N = 10,750) | |||
Median (interquartile range) or N (%) | ||||
Maternal characteristics | ||||
Age (years) | 26 | (22, 31) | 25 | (20, 30) |
≤19 | 1371 | (13) | 1948 | (18) |
20-24 | 3086 | (29) | 3330 | (31) |
25-29 | 3039 | (28) | 2779 | (26) |
30-34 | 2152 | (20) | 1811 | (17) |
≥35 | 1099 | (10) | 878 | (8) |
Ethnicity | ||||
White | 8777 | (82) | 7985 | (74) |
Black | 347 | (3) | 439 | (4) |
Hispanic | 585 | (5) | 943 | (9) |
Asian | 650 | (6) | 966 | (9) |
Native American | 208 | (2) | 204 | (2) |
Pacific Islander | 90 | (1) | 112 | (1) |
Unknowna | 93 | (1) | 101 | (1) |
BMIb | ||||
<18.5 | 231 | (2) | 425 | (4) |
18.5-24.9 | 4733 | (48) | 5498 | (56) |
25-29.9 | 2631 | (27) | 2261 | (23) |
30-34.9 | 1261 | (13) | 991 | (10) |
35+ | 1050 | (10) | 629 | (7) |
Marital status | ||||
Married | 7190 | (67) | 6548 | (61) |
Single | 3545 | (33) | 4186 | (39) |
Hypertension (yes) | 101 | (1) | 89 | (1) |
Induction of Labor (yes) | 3719 | (35) | 2597 | (24) |
Prolonged laborc (yes) | 678 | (6) | 441 | (4) |
Smoking (yes) | 846 | (8) | 1058 | (10) |
Pre-eclampsia (yes) | 681 | (6) | 692 | (6) |
Infant characteristics | ||||
Male sex | 7521 | (70) | 5374 | (50) |
Birth weight (grams) | ||||
2500-3500 | 1506 | (14) | 6388 | (59) |
3501-4500 | 8143 | (76) | 4317 | (40) |
>4500 | 1100 | (10) | 44 | (<1) |
5 min Apgar scores | ||||
7-10 | 10518 | (98) | 10555 | (98) |
4-6 | 187 | (>1) | 167 | (>1) |
0-3 | 45 | (<1) | 28 | (<1) |