Table 3 |
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|
Subgroup analysis of the association between previous cesarean section and placenta previa by study characteristics |
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|
Not including current study |
Including current study |
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|
|
|||||||||||
|
Number of Studies |
Random Effects Pooled OR |
Lower 95% CI |
Upper 95% CI |
I2 |
Number of Studies |
Random Effects Pooled OR |
Lower 95% CI |
Upper 95% CI |
I2 |
||
|
|
|||||||||||
|
Overall |
37 |
2.199 |
1.964 |
2.462 |
86.1% |
38 |
2.155 |
1.941 |
2.395 |
86.0% |
|
|
Study design |
|||||||||||
|
Cohort studies |
23 |
2.345 |
2.045 |
2.690 |
89.7% |
24 |
2.284 |
2.014 |
2.591 |
89.5% |
|
|
Case-control studies |
14 |
1.933 |
1.517 |
2.464 |
71.0% |
14 |
1.933 |
1.517 |
2.464 |
71.0% |
|
|
Setting |
|||||||||||
|
Population-based studies |
11 |
1.674 |
1.549 |
1.809 |
86.7% |
12 |
1.664 |
1.553 |
1.785 |
56.0% |
|
|
Hospital-based studies |
26 |
2.677 |
2.146 |
3.339 |
86.8% |
26 |
2.677 |
2.146 |
3.339 |
86.8% |
|
|
Timing of PP diagnosis |
|||||||||||
|
Confirmed at CS |
13 |
2.515 |
1.751 |
3.613 |
88.2% |
13 |
2.515 |
1.751 |
3.613 |
88.2% |
|
|
Other |
24 |
1.982 |
1.781 |
2.206 |
80.9% |
25 |
1.936 |
1.756 |
2.135 |
80.7% |
|
|
Inclusion criteria |
|||||||||||
|
Studies analyzing 2nd births only |
7 |
1.504 |
1.383 |
1.635 |
0% |
8 |
1.540 |
1.442 |
1.645 |
0% |
|
|
Other |
30 |
2.462 |
2.138 |
2.835 |
87.6% |
30 |
2.462 |
2.138 |
2.835 |
87.6% |
|
|
Risk-adjustment |
|||||||||||
|
Adjusted for age and parity |
14 |
1.648 |
1.515 |
1.792 |
52.3% |
15 |
1.642 |
1.524 |
1.769 |
54.1% |
|
|
Unadjusted estimates |
23 |
2.712 |
2.174 |
3.383 |
87.7% |
23 |
2.712 |
2.174 |
3.383 |
87.7% |
|
|
|
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|
Gurol-Urganci et al. BMC Pregnancy and Childbirth 2011 11:95 doi:10.1186/1471-2393-11-95 |
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