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| Psychological factors | Cases | Controls | χ2 | P value |
| Anxiety | 37.746 | < 0.001 | ||
| Yes | 297 (66.0%) | 257 (57.1%) | ||
| NO | 153 (34.0%) | 193 (42.9%) | ||
| Depression | 7.512 | 0.006 | ||
| Yes | 72 (33.0%) | 47 (21.6%) | ||
| NO | 37 (17.0%) | 54 (24.8%) |
CHD: coronary heart disease.
