Adjusted and crude odds ratios of factors associated with DDH in South Australian singleton live births (1986-93)
| Variables | No of subjects | Crude OR | Adjusted OR1-150 | Coefficients (β) in logisitc regression analysis | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Cases (n=1125) | Controls (n=146041) | OR (95% CI) | OR (95% CI) | |||||||
| Mother’s age (yrs): | ||||||||||
| <20 | 52 | 8725 | 1.00 | 1.00 | 0.0000 | |||||
| 20-24 | 228 | 32169 | 1.19 (0.87, 1.63) | 1.30 (0.96, 1.76) | 0.2618 | |||||
| 25-29 | 431 | 5572 | 1.30 (0.97, 1.76) | 1.46 (1.09, 1.96) | 0.3798 | |||||
| 30-34 | 313 | 36967 | 1.42 (1.05, 1.93) | 1.71 (1.26, 2.32) | 0.5360 | |||||
| 35+ | 101 | 12608 | 1.34 (0.95, 1.91) | 1.72 (1.22,2.44) | 0.5440 | |||||
| Parity: | ||||||||||
| 0 | 624 | 58976 | 2.13 (1.79, 2.52) | 2.19 (1.83, 2.62) | 0.7825 | |||||
| 1 | 322 | 51089 | 1.27 (1.05, 1.53) | 1.29 (1.07, 1.56) | 0.2553 | |||||
| 2+ | 179 | 35976 | 1.00 | 1.00 | 0.0000 | |||||
| Presentation and delivery: | ||||||||||
| Non-breech presentation | 813 | 140533 | 1.00 | 1.00 | 0.0000 | |||||
| Breech, caesarean delivery | 257 | 4758 | 9.34 (8.07, 10.80) | 10.03 (8.58, 11.72) | 2.3058 | |||||
| Breech, breech delivery | 55 | 750 | 12.68 (9.46, 16.95) | 17.15 (12.79, 22.99) | 2.8420 | |||||
| Baby’s sex: | ||||||||||
| Female | 882 | 70602 | 3.88 (3.36, 4.48) | 3.94 (3.41, 4.56) | 1.3717 | |||||
| Male | 243 | 75439 | 1.00 | 1.00 | 0.0000 | |||||
| Region of residence: | ||||||||||
| Metropolitan | 858 | 102487 | 1.56 (1.33, 1.82) | 1.45 (1.23, 1.69) | 0.3690 | |||||
| Outer metropolitan | 69 | 6751 | 1.90 (1.43, 2.52) | 1.86 (1.41, 2.46) | 0.6199 | |||||
| Country | 198 | 36803 | 1.00 | 1.00 | 0.0000 | |||||
| Oligohydramnios: | ||||||||||
| Present | 6 | 209 | 3.74 (1.50, 8.73) | 3.97 (1.69, 9.35) | 1.3790 | |||||
| Absent | 1119 | 145832 | 1.00 | 1.00 | 0.0000 | |||||
| Birthweight (g): | ||||||||||
| <2000 | 6 | 2260 | 0.33 (0.13, 0.77) | 0.30 (0.12, 0.77) | −1.1971 | |||||
| 2000-2499 | 17 | 4468 | 0.48 (0.28, 0.79) | 0.52 (0.31, 0.88) | −0.6469 | |||||
| 2500-2999 | 174 | 21782 | 1.00 (0.84, 1.20) | 0.90 (0.75, 1.08) | −0.1066 | |||||
| 3000-3499 | 440 | 55214 | 1.00 | 1.00 | 0.0000 | |||||
| 3500-3999 | 335 | 45627 | 0.92 (0.80, 1.07) | 1.12 (0.97, 1.30) | 0.1133 | |||||
| 4000-4499 | 124 | 14318 | 1.09 (0.89, 1.33) | 1.55 (1.26, 1.91) | 0.4367 | |||||
| 4500+ | 29 | 2372 | 1.53 (1.03, 2.27) | 2.67 (1.81, 3.94) | 0.9819 | |||||
| Gestation (weeks): | ||||||||||
| <37 | 24 | 7428 | 0.44 (0.28, 0.67) | 0.42 (0.25, 0.69) | −0.8703 | |||||
| 37 | 31 | 5992 | 0.70 (0.48, 1.02) | 0.59 (0.40, 0.86) | −0.5299 | |||||
| 38 | 136 | 17993 | 1.02 (0.84, 1.24) | 0.80 (0.66, 0.98) | −0.2214 | |||||
| 39 | 224 | 25133 | 1.20 (1.03, 1.41) | 0.90 (0.76, 1.06) | −0.1035 | |||||
| 40 | 517 | 69833 | 1.00 | 1.00 | 0.0000 | |||||
| 41 | 161 | 16862 | 1.29 (1.08, 1.55) | 1.26 (1.05, 1.51) | 0.2311 | |||||
| 42+ | 32 | 2800 | 1.54 (1.06, 2.24) | 1.48 (1.02, 2.13) | 0.3891 | |||||
| Constant | −7.2099 | |||||||||
↵1-150 Logistic regression analysis.