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Table 3 Sleep duration difference between Acute Myocardial Infarction (AMI) participants and controls

From: Sleep duration, snoring habits and risk of acute myocardial infarction in China population: results of the INTERHEART study

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)   
  1. N, number; p-value, significance of difference between group frequency determined by chi-square test.