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| Male (n=191) | Female (n=181) | |
|---|---|---|
| Months of age | 47.4 ± 12.0 | 47.0 ± 12.1 |
| Category of transportation | ||
| Short | 97 (50.8%) | 96 (53.0%) |
| Medium | 55 (28.8%) | 44 (24.3%) |
| Long | 39 (20.4%) | 41 (22.7%) |
Mean ± SD. Short, approx. 1 hr; medium, approx. 4 hr; Long, approx. 12 hr.
