Table 1 Background characteristics
| Â | Prolonged laboura, b | Normalalabour | Crude odds ratio |
|---|---|---|---|
|  | n = 180 | n = 649 |  |
| Â | n (%) | n (%) | (95% CI) |
Socio-demographic background | Â | Â | Â |
Age | Â | Â | Â |
<25Â years | 19 (10.6) | 84 (13.0) | 1.3 (0.8-2.3) |
25-35 years | 144 (80.4) | 469 (72.6) | 1.0 Ref.c |
>35Â years | 16 (8.9) | 93 (14.4) | 0.7 (0.4-1.5) |
Previous children | Â | Â | Â |
Primipara | 133 (74.3) | 241 (37.3) | 4.8 (3.3-7.0)*** |
Multipara | 46 (25.7) | 405 (62.7) | 1.0 Ref. |
Marital status | Â | Â | Â |
Living with partner | 175 (97.8) | 627 (97.1) | 1.0 Ref. |
Not living with partner | 4 (2.2) | 19 (2.9) | 0.7 (0.2-2.2) |
Country of birth | Â | Â | Â |
Sweden | 175 (97.8) | 616 (95.4) | 1.0 Ref. |
Other country | 4 (2.2) | 30 (4.6) | 0.5 (0.2-1.3) |
Education | Â | Â | Â |
Elementary school | 6 (3.4) | 25 (3.9) | 1.2 (0.5-3.0) |
High school | 74 (41.3) | 6257(40.3) | 1.0 Ref. |
College/university | 99 (55.3) | 355 (55.7) | 1.2 (0.5-2.9) |
Tobacco use in mid pregnancy (smoking/snuff) | Â | Â | Â |
Yes | 5 (2.8) | 42 (6.5) | 0.4 (0.1-1.1) |
No | 174 (97.2) | 604 (93.5) | 1.0 Ref. |
Body Mass Index | Â | Â | Â |
<20 | 14 (8.3) | 71 (11.5) | 0.6 (0.3-1.2) |
20-25 | 80 (47.6) | 268 (43.2) | 1.0 Ref. |
25-30 | 64 (38.1) | 248 (40.0) | 0.8 (0.5-1.2) |
30- | 10 (6.0) | 33 (5.3) | 1.0 (0.4-2.1) |