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Prevalence by recruitment site
| Site | Total cohort N = 468 | No apnea N = 388 | Apnea N = 80 | Prevalence (%) | Significance test (controlling for site) |
|---|---|---|---|---|---|
| University of Pittsburgh | 43.0 (n = 201) | 40.5 (n = 157) | 55.0 (n = 44) | 21.90 | χ2 (2) = 6.2, P =.045 (Pittsburgh > Toronto) |
| University of Toronto | 27.1 (n = 127) | 28.9 (n = 112) | 18.8 (n = 15) | 11.80 | |
| Washington University | 29.9 (n = 140) | 30.7 (n = 119) | 26.3 (n = 21) | 15.00 |
