Bivariate association between nap frequency and incident cardiovascular disease events, CoLaus study, Lausanne, Switzerland (n=3462)
| No nap | Nap frequency | p-value | |||
| 1–2 weekly | 3–5 weekly | 6–7 weekly | |||
| CVD event | <0.001 | ||||
| No (n=3307) (n (%)) | 1921 (95.4) | 655 (98.2) | 389 (94.7) | 342 (92.4) | |
| Yes (n=155) (n (%)) | 93 (4.6) | 12 (1.8) | 22 (5.4) | 28 (7.6) | |
P value from Pearson χ2.
CVD, cardiovascular disease.