Adjusted and crude odds ratio of factors associated with DDH in South Australian Singleton female live births (1986-93)
| Variables | No of subjects | Crude OR | Adjusted OR2-150 | Coefficients (β) in logisitc regression analysis | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Cases (n=882) | Controls (n=70602) | OR (95% CI) | OR (95% CI) | |||||||
| Mother’s age (yrs): | ||||||||||
| <20 | 44 | 4160 | 1.00 | 1.00 | 0.0000 | |||||
| 20-24 | 181 | 15694 | 1.09 (0.77, 1.54) | 1.21 (0.86, 1.69) | 0.1888 | |||||
| 25-29 | 314 | 26703 | 1.11 (0.80, 1.55) | 1.25 (0.90, 1.72) | 0.2196 | |||||
| 30-34 | 262 | 18044 | 1.37 (0.99,1.92) | 1.68 (1.21, 2.35) | 0.5196 | |||||
| 35+ | 81 | 6001 | 1.28 (0.87, 1.88) | 1.63 (1.11, 2.40) | 0.4907 | |||||
| Parity: | ||||||||||
| 0 | 482 | 28382 | 2.06 (1.70, 2.50) | 2.17 (1.77, 2.65) | 0.7744 | |||||
| 1 | 256 | 24736 | 1.26 (1.02,1.55) | 1.30 (1.06, 1.61) | 0.2657 | |||||
| 2+ | 144 | 17484 | 1.00 | 1.00 | 0.0000 | |||||
| Presentation and delivery: | ||||||||||
| Non-breech presentation | 655 | 67683 | 1.00 | 1.00 | 0.0000 | |||||
| Breech, caesarean delivery | 185 | 2507 | 7.63 (6.42, 9.05) | 8.65 (7.21,10.38) | 2.1576 | |||||
| Breech, breech delivery | 42 | 412 | 10.53 (7.49,14.76) | 15.10 (10.79, 21.13) | 2.7147 | |||||
| Region of residence: | ||||||||||
| Metropolitan | 672 | 49687 | 1.58 (1.32, 1.90) | 1.48 (1.23, 1.77) | 0.3901 | |||||
| Outer metropolitan | 59 | 3222 | 2.15 (1.57,2.93) | 2.12 (1.56, 2.89) | 0.7521 | |||||
| Country | 151 | 17693 | 1.00 | 1.00 | 0.0000 | |||||
| Oligohydramnios: | ||||||||||
| Present | 5 | 116 | 3.46 (1.25, 8.81) | 4.07 (1.59, 10.43) | 1.4030 | |||||
| Absent | 877 | 70486 | 1.00 | 1.00 | 0.0000 | |||||
| Birthweight (g): | ||||||||||
| <2000 | 6 | 1099 | 0.44 (0.18, 1.02) | 0.36 (0.14, 0.95) | −1.0147 | |||||
| 2000-2499 | 14 | 2480 | 0.46 (0.26, 0.80) | 0.51 (0.28, 0.90) | −0.6819 | |||||
| 2500-2999 | 142 | 12573 | 0.91 (0.75, 1.11) | 0.88 (0.71, 1.08) | −0.1320 | |||||
| 3000-3499 | 356 | 28751 | 1.00 | 1.00 | 0.0000 | |||||
| 3500-3999 | 255 | 19901 | 1.03 (0.88, 1.22) | 1.13 (0.95, 1.33) | 0.1185 | |||||
| 4000-4499 | 89 | 5115 | 1.41 (1.10, 1.79) | 1.60 (1.26, 2.04) | 0.4694 | |||||
| 4500+ | 20 | 683 | 2.36 (1.46, 3.80) | 2.95 (1.85, 4.70) | 1.0801 | |||||
| Gestation (weeks): | ||||||||||
| <37 | 21 | 3441 | 0.51 (0.32, 0.80) | 0.47 (0.27, 1.23) | −0.7533 | |||||
| 37 | 23 | 2829 | 0.68 (0.43, 1.05) | 0.58 (0.38, 0.91) | −0.5392 | |||||
| 38 | 102 | 8782 | 0.97 (0.77, 1.21) | 0.78 (0.62, 0.98) | −0.2484 | |||||
| 39 | 173 | 12320 | 1.17 (0.97, 1.40) | 0.89 (0.74, 1.08) | −0.1115 | |||||
| 40 | 410 | 34077 | 1.00 | 1.00 | 0.0000 | |||||
| 41 | 128 | 7873 | 1.35 (1.10, 1.66) | 1.28 (1.04, 1.56) | 0.2433 | |||||
| 42+ | 25 | 1280 | 1.62 (1.06, 2.48) | 1.49 (0.98, 2.25) | 0.3958 | |||||
| Constant | −5.7437 | |||||||||
↵2-150 Logistic regression analysis.