|
Variable
|
Level
|
Cohort n (%)
|
Comparison n (%)
|
p-value
|
|---|
|
Gravida
|
1
|
261 (25.5)
|
9237 (43.3)
|
< 0.001
|
|
2
|
206 (20.1)
|
5665 (26.5)
| |
|
3
|
172 (16.8)
|
3147 (14.7)
| |
|
> = 4
|
385 (37.6)
|
3307 (15.5)
| |
|
Parity
|
1
|
309 (30.8)
|
10,747 (51.1)
|
< 0.001
|
|
2
|
232 (23.1)
|
6035 (28.7)
| |
|
> = 3
|
463 (46.1)
|
4257 (20.2)
| |
|
Gestational age at initial assessment
|
1st trimester
|
659 (63.5)
|
18,506 (84.4)
|
< 0.001
|
|
2nd trimester
|
311 (30.0)
|
2757 (12.6)
| |
|
3rd trimester
|
68 (6.6)
|
654 (3.0)
| |
|
Gestational age at initial assessment (mean (SD))
| |
13.3 (7.5)
|
10.5 (5.5)
|
< 0.001
|
- Missing data (n): Gravida (cohort: 87; comparison 2058); Parity (cohort: 107; comparison: 2357); Gestational age at initial assessment (cohort: 73; comparison: 1497)
- Chi-squared analyses were used to compare differences between the cohort and matched comparison groups for all variables in this table
