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. 2012 Nov 22;12:135. doi: 10.1186/1471-2393-12-135

Table 1.

Demographic variables birth seat births compared to all other positions excl. ceaserean section

 
Birth seat group
Control group
RR/mean difference
 
 
n= 253
n= 697
(95% CI)
P-value
  n (%) n (%)    
Age groups
 
 
 
 
< 25 years
44 (17.4)
121 (17.3)
1.00 (0.73 - 1.37)
1.00
25-35 years
192 (75.1)
495 (71.1)
1.06 (0.98 - 1.16)
0.14
> 35 years
19 (7.5)
81 (11.6)
0.64 (0.40 - 1.04)
0.07
Body Mass Index (SD)
22.7 (±5.1)
22.7 (±5.1)
0.37 (0.80 - 6.65)
0.85
Smoking
22 (8.0)
95 (13.6)
0.63 (0.41 - 0.99)
0.04
Previous caesarean section
2 (0.7)
7 (1.0)
0.78 (0.16 - 3.76)
1.00
Gestational Age
 
 
 
 
< 37 + 6 weeks
10 (3.9)
29 (4.1)
0.95 (0.47 - 1.91)
1.00
38 + 0 - 40 + 6 weeks
202 (79.8)
521 (74.7)
1.06 (0.99 - 1.15)
0.12
> 41 + 0 weeks 41 (16.2) 147 (21.0) 0.76 (0.56 - 1.08) 0.09