Table 1.

Demographic information and socioeconomic status of cases and controls

VariablesCase (%; N = 1,424)Control (%; N = 4,543)Pa
Study area
 Dafeng625 (43.9)2,533 (55.8)
 Ganyu799 (56.1)2,010 (44.2)
Gender
 Male995 (69.9)3,415 (75.2)
 Female429 (30.1)1,128 (24.8)<0.001
Age, y
 Mean (SD)63.3 (11.1)64.0 (11.3)0.037
 <50166 (11.7)499 (11.0)
 50-328 (23.0)989 (21.8)
 60-468 (32.9)1,440 (31.7)
 70-387 (27.2)1,309 (28.8)
 ≥8075 (5.3)306 (6.7)0.173
Education level
 Illiteracy706 (49.6)2,309 (50.8)
 Primary466 (32.7)1,393 (30.7)
 Middle197 (13.8)644 (14.2)
 High44 (3.1)174 (3.8)
 College11 (0.8)23 (0.5)0.300
Income 10 years ago (Yuan/year)
 Mean (SD)2,260 (2170)2,220 (2481)0.565
 <1,000284 (19.9)959 (21.1)
 1,000-266 (18.7)843 (18.6)
 1,500-380 (26.7)1,234 (27.2)
 ≥2500494 (34.7)1,507 (33.2)0.670
BMIb
 Mean (SD)22.2 (4.3)22.8 (3.6)<0.001
 <18.5204 (14.3)307 (6.8)
 18.5–23.9862 (60.5)2,881 (63.4)
 24.0–27.9285 (20.0)1,103 (24.3)
 ≥28.073 (5.1)252 (5.5)<0.001
  • aOn the basis of χ2 testing; t testing for the mean.

  • bChinese recommend standard was used for the cutoff points of overweight and obesity: low weight (BMI < 18.5), overweight (BMI ≥ 24.0 and BMI < 28.0), obesity (BMI ≥ 28.0).