Table 1: The demographic and clinical characteristics of all subjects.

VariablesCases ( )Control ( )

Age (years) NS
Sex
 Female148 (60.4%)155 (58.7%)NS
Obesity132 (53.9%)116 (43.9%)0.013
Smoker (%)99 (40.4%)98 (37.1%)0.054
History of heavy labor work (%)65 (26.5%)61 (23.1%)0.051