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Table 1 Non-smokers patients' and controls' characteristics, by group of study

From: The association between secondhand smoke and the risk of developing acute coronary syndromes, among non-smokers, under the presence of several cardiovascular risk factors: The CARDIO2000 case-control study

Group of study ACS patients (n = 848) Controls (n = 1078)
  Non-smokers exposed to passive smoking
  Yes No Yes No
Number of individuals 297 (35%) 551 (65%) 259 (24%) 819 (76%)
Age 60 ± 10 61 ± 10 60 ± 10 61 ± 9
Hypertension 137 (46%) 242 (44%) 65 (25%) 213 (26%)
Hypercholesterolemia 190 (64%) 342 (62%) 85 (33%) 254 (31%)
Diabetes mellitus 74 (25%) 143 (26%) 18 (7%) 49 (6%)
Family history of CHD 134 (45%) 265 (48%) 44 (17%) 123 (15%)
Physical inactivity 199 (67%) 336 (61%) 148 (57%) 401 (49%)
Obesity 190 (64%) 336 (61%) 96 (37%) 311 (38%)
Years of education 9 ± 3 11 ± 3 * 11 ± 2 13 ± 3 *
Depression 71 (24%) 127 (23%) 44 (17%) 156 (19%)
Income (#,000 US$) 7.25± 1.1 7.12± 2.0 8.23± 1.4 8.57± 2.1
  1. * P-value < 0.05, comparisons between, subjects who were exposed to passive smoking vs. subjects who were not exposed to passive smoking, by group of study