Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Comparison of basic data between the two groups of pregnant women.
| Group | Age (years old) | Gestational age (weeks) | Number of births (times) |
|---|---|---|---|
| Group I (n = 9,453) | 28.03 ± 2.15 | 12.35 ± 0.55 | 1.08 ± 0.22 |
| Group II (n = 204) | 27.79 ± 3.04 | 12.18 ± 0.41 | 1.12 ± 0.30 |
| t | -0.155 | 0.121 | -0.037 |
| P | 0.978 | 0.744 | 0.826 |
