Table 1.
Characteristics of patients with spontaneous preterm birth (SPTB) and controls
| No. (%) of |
|||||
|---|---|---|---|---|---|
| Maternal characteristics | patients* | controls† |
P | ||
| Mean age at delivery (years)‡ |
30 (18-41) |
30 (23-41) |
0.385§ |
||
| Gestational age at delivery |
- |
||||
| Extremely preterm <28 week |
7 (6.2) |
||||
| Very preterm 32-28 weeks |
33 (29.2) |
||||
| Moderate to late preterm 32-37 weeks |
73 (64.6) |
||||
| Smoking before pregnancy |
<0.001¶ |
||||
| yes |
37 (32.7) |
6 (8.8) |
|||
| no |
76 (67.3) |
62 (91.2) |
|||
| Previous PTB |
- |
||||
| yes |
13 (11.5) |
||||
| no |
100 (88.5) |
||||
| Familial PTB |
- |
||||
| yes |
35 (31.8) |
||||
| no |
75 (68.2) |
||||
|
Newborn characteristics | |||||
| Mean birth weight (g)‡ |
2334 (605-3915) |
3402 (1570-4350) |
<0.001§ |
||
| Congenital anomalies |
0 |
0 |
|||
| Evidence of infection | 0 |
0 | |||
*available for 113/118 women and newborns with SPTB.
†available for 68/119 control women and newborns.
‡data are presented as mean and range.
§t-test.
¶χ2 test.