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Table 5 Interaction between snoring frequency and other related factors of AMI

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

  No snoring 0-1 time per week 1-3 times per week >3 times P-value for interaction
Age (years), mean (SD)      0.0133
    Case 62.5 (12.4) 61.8 (11.1) 62.5 (11.7) 60.9 (11.4)  
    Control 59.5 (12.7) 59.9 (10.5) 61.0 (11.4) 60.5 (11.0)  
BMI (kg/m2), mean (SD)      0.7755
    Case 24.0 (3.4) 24.5 (3.4) 24.8 (3.1) 25.6 (3.3)  
    Control 23.6 (3.0) 24.7 (2.7) 24.6 (2.8) 25.3 (3.9)  
WHR, mean (SD)      0.0179
    Case 0.87 (0.08) 0.89 (0.07) 0.86 (0.09) 0.91 (0.08)  
    Control 0.88 (0.08) 0.89 (0.08) 0.86 (0.09) 0.90 (0.07)  
Hypertension, n (%)      0.2176
    Case 190 (34.8) 198 (31.2) 450 (40.4) 289 (53.3)  
    Control 111 (15.3) 153 (19.2) 286 (26.8) 105 (33.6)  
Diabetes, n (%)      0.8630
    Case 58 (10.6) 63 (9.9) 153 (13.7) 76 (14.0)  
    Control 21 (2.9) 18 (2.3) 35 (3.3) 12 (3.8)  
Stroke, n (%)      0.2193
    Case 42 (7.7) 54 (8.5) 155 (13.9) 63 (11.7)  
    Control 16 (2.2) 19 (2.4) 47 (4.4) 19 (6.1)  
Current smokers, n (%)      0.1616
    Case 242 (44.3) 356 (56.1) 655 (58.7) 404 (74.5)  
    Control 214 (29.5) 325 (40.8) 462 (43.2) 176 (56.2)  
Alcohol consumption (≥1/week), n (%)      0.8611
    Case 50 (9.2) 85 (13.4) 198 (17.8) 121 (22.3)  
    Control 74 (10.2) 82 (10.3) 186 (17.4) 78 (24.9)  
Physical activity, n (%)      0.7550
    Case 93 (17.0) 65 (10.3) 122 (11.0) 132 (24.4)  
    Control 137 (18.9) 117 (14.7) 196 (18.3) 84 (27.0)  
Education (≤8 years), n (%)      0.5209
    Case 292 (53.5) 340 (53.6) 631 (56.6) 253 (46.7)  
    Control 308 (42.5) 343 (43.3) 520 (48.6) 114 (36.4)  
Low family income, n (%)      0.8004
    Case 188 (34.6) 200 (31.6) 323 (31.7) 175 (32.4)  
    Control 221 (30.7) 242 (30.4) 321 (30.1) 76 (24.3)  
Permanent stress, n (%)      0.0148
    Case 199 (36.5) 262 (41.3) 399 (35.8) 193 (35.7)  
    Control 194 (26.8) 263 (33.0) 369 (34.6) 101 (32.3)  
Depression, n (%)      0.5744
    Case 113 (21.3) 118 (18.9) 179 (16.2) 127 (23.8)  
    Control 75 (10.5) 70 (8.9) 77 (7.3) 45 (14.4)  
Vegetables consumption, (times/week), mean (SD)      0.0001
    Case 7.1 (5.3) 6.6 (5.0) 8.2 (5.5) 9.3 (6.0)  
    Control 7.7 (5.5) 7.5 (4.9) 8.3 (5.4) 8.4 (5.8)  
Fruit consumption, (times/week), mean (SD)      0.0270
    Case 3.5 (3.5) 3.5 (3.2) 4.5 (3.5) 4.2 (4.4)  
    Control 4.4 (4.0) 4.5 (3.3) 5.3 (3.5) 4.6 (3.8)