Table 3.
Sleep duration difference between Acute Myocardial Infarction (AMI) participants and controls
| Nap and sleep duration | AMI cases | Controls | χ 2 | P -value |
|---|---|---|---|---|
| Nap duration (minutes) |
N = 1509 |
N = 1455 |
25.42 |
0.0001 |
| ≤ 30 |
384 (25.5) |
489 (33.6) |
|
|
| 30-60 |
791 (52.4) |
704 (48.4) |
|
|
| > 60 |
334 (22.1) |
262 (18.0) |
|
|
| Sleep duration (hours) |
N = 2873 |
N = 2918 |
17.09 |
0.0002 |
| ≤ 6 |
499 (17.4) |
444 (15.2) |
|
|
| 6-8 |
1787 (62.2) |
1966 (67.4) |
|
|
| > 8 | 587 (20.4) | 508 (17.4) |
N, number; p-value, significance of difference between group frequency determined by chi-square test.