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Table 1 General characteristics of the study population (n = 1,537) by BMI categories

From: Anemia in relation to body mass index and waist circumference among chinese women

  Underweight Normal weight Overweight Obese P value
n (%) 89 (5.8) 834 (54.3) 424 (27.6) 190 (12.4)  
Age (years) (%)      
  < 35 38.2 29.5 16.5 9.5 < 0.001
  35-44 13.5 25.4 21.9 21.6  
  45-54 13.5 19.9 33.7 26.3  
  ≥ 55 34.8 25.2 27.8 42.6  
Residence      
  Urban city 23.6 22.1 27.4 31.1 0.03
  Rural city 76.4 77.9 72.6 68.9  
Socio-economic status      
  Low 26.1 32.4 33.9 34.0 0.39
  Medium 38.6 31.0 34.8 33.0  
  High 35.2 36.6 31.3 33.0  
Education      
  Low 50.6 54.9 59.4 65.3 0.002
  Medium 27.0 32.3 30.9 21.1  
  High 22.5 12.8 9.7 13.7  
Hemoglobin (g/L)1 125.0 (14.6) 124.9 (15.4) 128.4 (15.0) 131.9 (15.1) < 0.001
Energy (kcal/d) 1916 (563) 2124 (582) 2179 (639) 2198 (637) 0.001
Iron (mg/d) 20.0 (7.4) 23.4 (9.6) 24.2 (9.8) 23.8 (9.5) 0.003
Vitamin C (mg/d) 61 (33) 61 (38) 59 (39) 60 (36) 0.886
  1. 1Mean (SD), all such values; BMI, body mass index. Chi-square test for categorical variables and ANOVA for continuous variables.