TABLE 1

Distribution of variables

VariablesStudy groupControl groupp-value
Subjects, n6060
Sex, n (%)
 Female27 (45)26 (43)0.523
 Male33 (55)34 (57)
Age years, mean±sd50.57±11.4953.07±11.550.237#
Pack-years smoking0.032
 Mean±sd10.90±16.3716.52±21.29
 Median (1st–3rd quartile)0 (0–15)13.5 (0–25.5)
BMI kg·m−2
 Mean±sd31.84±5.6531.89±7.20.914
 Median (1st–3rd quartile)31.25 (27.92–36.15)30.97 (28–34.7)
BMI category, n (%)
 Obese5 (8)6 (10)0.945
 Overweight23 (38)22 (37)
 Normal32 (53)32 (53)
Neck circumference cm
 Mean±sd40.04±4.0340.82±3.770.131
 Median (1st–3rd quartile)39 (38–42)41 (38.25–43)
Comorbidities, n (%)
 Hypertension17 (28)24 (40)
 Diabetes mellitus11 (18)9 (15)
 Coronary artery disease5 (8)12 (20)
 Asthma4 (7)4 (7)
 COPD2 (3)1 (2)

Continuous data were expressed as mean±sd and median (1st–3rd quartile). BMI: body mass index. #: independent samples t-test; : Mann–Whitney U test.