TABLE II.
Adjusted Prevalence Odds Ratios for Isolated, Live Singleton Full-term Idiopathic Talipes Equinovarus Births, Iowa 1997–2005
| Characteristics | ITEV births (n =347)a | Iowa births (n =304,308)a | aPOR (95% CI)b |
|---|---|---|---|
| Infant | |||
| Sex | |||
| Female | 120 | 148,993 | Reference |
| Male | 227 | 155,315 | 1.8 (1.5, 2.3) |
| Birth weight (g) | |||
| <2,500 | 10 | 4,907 | 1.8 (0.9, 3.3) |
| 2,500–3,500 | 181 | 155,003 | Reference |
| >3,500 | 156 | 144,342 | 0.9 (0.7, 1.1) |
| Maternal | |||
| Age at delivery (years) | |||
| <20 | 30 | 29,111 | 0.7 (0.5, 1.1) |
| 20–34 | 293 | 243,125 | Reference |
| ≥35 | 24 | 32,048 | 0.6 (0.4, 1.0) |
| Education (years) | |||
| <12 | 62 | 43,136 | 1.4 (1.0, 1.8) |
| 12 or more | 285 | 258,798 | Reference |
| Smoking during pregnancy | |||
| No | 263 | 249,906 | Reference |
| Yes | 83 | 51,737 | 1.5 (1.2, 1.9) |
aPOR, adjusted prevalence odds ratio; ITEV, idiopathic talipes equinovarus; CI, confidence interval.
a
Frequencies of ITEV births and Iowa births may not total 347 and 304,308, respectively, due to missing responses.
b
Each variable adjusted for all other variables in the table.