Table 2.
Baseline characteristics of study participants, overall and by study sites.
| Characteristics | Masjed-Solayman n=900 |
Shushtar n=900 |
Overall n=1800 |
P valueb |
| Age (year) | 29 (25-32)a |
29 (25-32) |
29 (25-32) |
.63 |
| Marriage age (year) | 20 (18-22) |
19 (17-23) |
19 (17-22) |
.08 |
| First delivery age (year) | 20 (18-22) |
20 (18-21) |
20 (18-22) |
.57 |
| First pregnancy age (year) | 21 (19-24) |
20 (18-24) |
21 (19-24) |
.08 |
| Pregnancy week | 10 (9-12) |
10 (9-12) |
9 (10-12) |
.07 |
| Gravity | 2 (1-3) |
2 (1-3) |
2 (1-3) |
.95 |
| Parity | 1 (0-2) |
1 (0-2) |
1 (0-2) |
.86 |
| Number of abortions | 0 (0-0) |
0 (0-0) |
0 (0-0) |
.96 |
| Number of children | 1 (0-2) |
1 (0-2) |
1 (0-2) |
.79 |
| Vitamin D4 (ng/ml) | 11 (7-16) |
11 (7-16) |
11 (7-16) |
.96 |
| SBP (6-10w) (mg/dl) | 115 (110-120) |
120 (110-120) |
120 (110-120) |
.87 |
| DPB (6-10w) (mg/dl) | 70 (60-70) |
70 (70-70) |
70 (60-70) |
.65 |
| Maternal weight (6-10 w) | 65 (59-70) |
64 (59-70) |
64 (59-70) |
.98 |
aMedian (interquartile range).
bP value obtained from independent samples distribution nonparametric Mann-Whitney test (the significance level is <.05).