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Table 1 Socio-demographic and clinical characteristics of the sample population

From: Exploring the nonlinear relationship between body mass index and health-related quality of life among adults: a cross-sectional study in Shaanxi Province, China

Characteristic Men (n = 18,382) Women (n = 19,520)
Age, years   
 Mean (SD) 50.01 (14.91) 48.71 (14.76)
BMI, kg/m2   
 Mean (SD) 22.37 (2.82) 21.98 (2.95)
EQ-5D utility score   
 Mean (SD) 0.96 (0.11) 0.95 (0.12)
BMI WHO international categories   
 Underweight, n(%) 1323 (7.20) 2132 (10.92)
 Normal, n(%) 14,108 (76.75) 14,587 (74.73)
 Overweight, n(%) 2761 (15.02) 2596 (13.30)
 Obese, n(%) 190 (1.03) 205 (1.05)
Marital status   
 Unmarried, n(%) 1654 (9.00) 864 (4.43)
 Married, n(%) 15,560 (84.65) 16,782 (85.97)
 Divorced or widowed, n(%) 1168 (6.35) 1874 (9.60)
Educational attainment   
 Illiteracy, n(%) 1841 (10.02) 4214 (21.59)
 Elementary, n(%) 4677 (25.44) 5210 (26.69)
Middle school, n(%) 7983 (43.43) 6964 (35.68)
 High school, n(%) 2806 (15.26) 2140 (10.96)
 University, n(%) 1075 (5.85) 992 (5.08)
Residential areas   
 Urban, n(%) 5932 (32.27) 6839 (35.04)
 Rural, n(%) 12,450 (67.73) 12,681 (64.96)
Physical activity   
 No, n(%) 14,487 (79.04) 14,677 (75.52)
 Yes, n(%) 3842 (20.96) 4757 (24.48)
Co-morbidities   
 Hypertension, n(%) 2220 (12.08) 2903 (14.87)
 Diabetes, n(%) 434 (2.36) 502 (2.57)
 Heart problems, n(%) 359 (1.95) 500 (2.56)
 Respiratory problems, n(%) 302 (1.64) 231 (1.18)
 Musculoskeletal problems, n(%) 602 (3.27) 892 (4.57)
 Cancer, n(%) 18 (0.10) 29 (0.15)
  1. BMI body mass index
  2. WHO World Health Organization
  3. SD standard deviation