|
Variables
|
Cash & Carry period
|
NHIS period
|
|---|
|
Adjusted†
|
Adjusted†
|
|---|
|
OR 95% CI
|
OR 95% CI
|
|---|
|
Maternal age
|
|
< 18 (RC)
|
1
|
1
|
|
18–24
|
0.41 [0.18, 0.88]*
|
0.62 [0.18, 2.07]
|
|
25–34
|
0.44 [0.20, 0.96]*
|
0.56 [0.17, 1.85]
|
|
35 >
|
0.72 [0.33, 1.61]
|
0.69 [0.20, 2.35]
|
|
Maternal parity
|
|
None (RC)
|
1
|
1
|
|
One
|
0.73 [0.50, 1.06]
|
1.10 [0.70, 1.70]
|
|
Two
|
0.77 [0.51, 1.16]
|
1.24 [0.76, 2.02]
|
|
Three
|
1.87 [1.33, 2.63]***
|
1.51 [0.88, 2.60]
|
|
Four-plus
|
1.61 [1.18, 2.21]**
|
2.12 [1.23, 3.64]**
|
|
Type of birth
|
|
Caesarean (RC)
|
1
|
1
|
|
Vagina
|
0.41 [0.32, 0.54]***
|
0.60 [0.44, 0.83]**
|
|
Nature of delivery
|
|
Twins (RC)
|
1
|
1
|
|
Singleton
|
0.41 [0..30, 0.57]***
|
1.34 [0.77, 2.34]
|
|
Sex
|
|
Male (RC)
|
1
|
1
|
|
Female
|
1.08 [0.85, 1.35]
|
0.96 [0.72, 1.28]
|
|
Blood loss after delivery
|
|
< 200 (RC)
|
1
|
1
|
|
200–250
|
0.61 [0.43, 0.85]**
|
1.04 [0.69, 1.57]
|
|
> 250
|
1.81 [0.57, 1.16]
|
1.62 [0.89, 2.93]
|
|
Fetal heart rate (bpm)
|
|
< 130 (RC)
|
1
|
1
|
|
130–140
|
0.80 [0.35, 1.80]
|
0.40 [0.20, 0.80]*
|
|
> 140
|
0.29 [0.29, 1.67]
|
0.85 [0.33, 2.14]
|
-
Note. OR odds ratio, CI confidence interval, RC reference category; *p < 0.05; **p < 0.01; ***p < 0.001, p-values obtained from multivariable binary logistic regression analysis (Wald test statistic); † = Adjusted for all other variables in the model known to influence the outcome
