Table 6

The ORs (95% CIs) of acute myocardial infarction relative to few days off, and insufficient sleep according to weekly working hours in the recent past

Weekly working hours in the past month
Days off or sleep≤60 OR (95%CI)≥61 OR (95%CI)p Value for interaction
Adjusted for cigarette-year, alcohol drinking, overweight, hypertension, diabetes mellitus, hyperlipidaemia, parental coronary heart disease, job type, and sedentary job; p values are based on the likelihood ratio test.
Days off in the past month:
    ≥21.0 (referent)1.3 (0.7 to 2.3)
    <22.1 (0.7 to 6.1)3.7 (1.2 to 11.8)0.85
Days of <5 h sleep in the past week:
    ≤11.0 (referent)1.8 (1.0 to 3.2)
    ≥23.6 (1.8 to 7.5)3.1 (0.8 to 12.2)0.98