Table 1.
Maternal data by gestational age in weeks
| 34 | 35 | 36 | LPI | 37 | 38 | 39 | 40 | 41 | TI | 34-41 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| |
n = 151 |
n = 241 |
n = 458 |
n = 850 |
n = 1149 |
n = 2444 |
n = 3343 |
n = 3729 |
n = 2261 |
n = 12926 |
n = 13776 |
|
Age |
|
|
|
|
|
|
|
|
|
|
|
| Mean (SD) |
32.4(5.4) |
31.7(6.6) |
32.9(4.8) |
32.5(5.5) |
32.7(5.2) |
32.5(5.1) |
32.1(5.0) |
32.1(5.1) |
31.9(5.0) |
32.2(5.1) |
32.2(5.2) |
|
Number of US*** |
|
|
|
|
|
|
|
|
|
|
|
| Mean (SD) |
4.7(2.3) |
5.0(2.8) |
5.2(4.7) |
5.1(4.0) |
4.5(3.4) |
4.0(2.2) |
3.6(1.6) |
3.5(1.5) |
3.5(2.0) |
3.7(2.0) |
3.9(2.1) |
|
Ethnicity |
|
|
|
|
|
|
|
|
|
|
|
| Caucasian |
119(89.5) |
181(85.0) |
357(86.9) |
657(86.8) |
933(88.0) |
1953(85.8) |
2722(88.1) |
3097(88.6) |
1852(88.0) |
10557(87.8) |
11214(81.4) |
| African |
7(5.3) |
10(4.7) |
21(5.1) |
38(5.0) |
51(4.8) |
115(5.1) |
135(4.4) |
155(4.4) |
115(5.5) |
571(4.8) |
609(4.4) |
| Hispanic |
3(2.3) |
18(8.4) |
22(5.4) |
43(5.7) |
41(3.9) |
112(4.9) |
138(4.5) |
128(3.7) |
71(3.4) |
490(4.0) |
533(3.8) |
| Asian |
4(3.0) |
4(1.9) |
11(2.7) |
19(2.5) |
35(3.3) |
97(4.3) |
94(3.0) |
114(3.3) |
67(3.2) |
407(3.4) |
426(3.1) |
|
ART*** |
|
|
|
|
|
|
|
|
|
|
|
| Yes |
4(2.9) |
3(1.3) |
6(1.3) |
13(1.6) |
16(1.4) |
12(0.5) |
15(0.5) |
14(0.4) |
7(0.3) |
64(0.5) |
73(0.5) |
|
Medical disorders*** |
|
|
|
|
|
|
|
|
|
|
|
| Yes | 53(45.7) | 83(40.5) | 128(32.6) | 264(37.0) | 281(27.6) | 422(18.8) | 265(8.6) | 288(8.4) | 151(7.4) | 1407(11.9) | 1671(12.1) |
Data are expressed as absolute numbers and proportions (%) of observed data in each category, unless otherwise specified. All tests refer to comparisons between late preterm infants (LPI) and term infants (TI). US ultrasounds; ART assisted reproductive technologies. ***P < .001, using χ2, Fisher or t test as appropriate.