|
Odds Ratios for dystocia with 95% confidence intervals according to obstetric characteristics |
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| N 2810 |
Un-adjusted OR |
Adjusted OR* (95% CI) |
All variables included |
All variables included except birth weight |
Trend† OR (95% CI) |
|
|
|
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| Infertility treatment prior to current pregnancy |
||||||
| No |
2449 |
1 (ref.) |
1 (ref.) |
1 (ref.) |
1 (ref.) |
|
| Yes |
184 |
1.13 |
0.95 (0.69–1.31) |
0.92 (0.65–1.29) |
1.09 (0.78–1.53) |
|
| Missing |
177 |
|||||
| Dilatation of cervix at admission |
0.83 (0.80–0.86) |
|||||
| 0–3 cm |
1086 |
1.67 |
1.63 (1.38–1.92) |
1.29 (1.06–1.57) |
1.21 (1.00–1.47) |
|
| 4–10 cm |
1575 |
1 (ref.) |
1 (ref.) |
1 (ref.) |
1 (ref.) |
|
| Missing |
149 |
|||||
| Consistency of cervix at admission |
||||||
| Tense |
585 |
1.25 |
1.31 (1.04–1.65) |
1.0 (0.79–1.26) |
0.98 (0.79–1.23) |
|
| Soft |
1794 |
1 (ref.) |
1 (ref.) |
1 (ref.) |
1 (ref.) |
|
| Missing |
431 |
|||||
| Thickness of lower segment at admission |
||||||
| Thick |
583 |
1.30 |
1.32 (1.09–1.61) |
0.88 (0.69–1.12) |
0.91 (0.72–1.14) |
|
| Thin |
1712 |
1 (ref.) |
1 (ref.) |
1 (ref.) |
1 (ref.) |
|
| Missing |
515 |
|||||
| Descent of fetal head at admission |
||||||
| Above the inter-spinal-line |
2367 |
2.33 |
2.29 (1.80–2.92) |
1.80(1.32–2.45) |
1.92 (1.42–2.58) |
|
| At or under the inter-spinal-line |
311 |
1 (ref.) |
1 (ref.) |
1 (ref.) |
1 (ref.) |
|
| Missing |
132 |
|||||
| Fetal head-to-cervix contact |
||||||
| Good |
1921 |
1 (ref.) |
1 (ref.) |
1 (ref.) |
1 (ref.) |
|
| Poor |
159 |
1.88 |
1.83 (1.31–2.56) |
1.62 (1.09–2.40) |
1.57 (1.08–2.27) |
|
| Cannot be assessed |
455 |
|||||
| Missing |
275 |
|||||
| Birth weight |
1.001 (1.00–1.00) |
|||||
| 2000–2499 gr |
23 |
0.14 |
0.14 (0.32–0.60) |
0.27 (0.61–1.21) |
||
| 2500–2999 gr |
282 |
0.57 |
0.51 (0.38–0.69) |
0.55 (0.40–0.77) |
||
| 3000–3499 gr |
1040 |
0.78 |
0.74 (0.62–0.89) |
0.76 (0.62–0.93) |
||
| 3500–3999 gr |
1016 |
1 (ref.) |
1 (ref.) |
1 (ref.) |
||
| 4000–4499 gr |
392 |
1.23 |
1.29 (1.02–1.65) |
1.06 (0.83–1.41) |
||
| ≥ 4500 gr |
53 |
1.36 |
1.37 (0.78–2.41) |
1.32 (0.70–2.46) |
||
| Epidural analgesia |
||||||
| No epidural |
2284 |
1 (ref.) |
1 (ref.) |
1 (ref.) |
1 (ref.) |
|
| Epidural analgesia |
316 |
5.49 |
5.65 (4.33–7.38) |
4.65 (3.53–6.13) |
4.77 (3.65–6.22) |
|
|
* Crude Odds Ratios controlled for age, height, pre-pregnancy BMI and physical activity, including a variable for the participating departments (9 levels). † Test for trend performed on continuous variables. First line: Regression coefficient for change in OR per unit increased, second line: 95% CI. | ||||||
Kjærgaard et al. BMC Pregnancy and Childbirth 2008 8:45 doi:10.1186/1471-2393-8-45 |
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