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Table 2 General characteristics of the study population, stratified by in-home solid fuel use, N (%) or Mean ± SD

From: In-home solid fuel use and cardiovascular disease: a cross-sectional analysis of the Shanghai Putuo study

Variables Ever user (n = 11,013) Nonuser (n = 3,055) P-valuec
Age, yrs 52.9 ± 15.0 33.2 ± 12.5 < 0.001
   18-29 842 (36.2) 1,481 (63.8)  
   30-39 1,363 (61.7) 848 (38.3)  
   40-49 1,898 (84.8) 340 (15.2)  
   50-59 3,558 (93.3) 255 (6.7)  
   60 ≥ 3,352 (96.2) 131 (3.8)  
Gender    
   Male 5,053 (78.2) 1,410 (21.8) 0.01
   Female 5,960 (78.4) 1,645 (21.6) Reference
Education    
   Less than high school 5,248 (92.7) 413 (7.3) < 0.001
   High school 4,502 (74.2) 1,562 (25.8) 0.76
   College or above 1,262 (53.9) 1,079 (46.1) Reference
BMIa, kg/cm2    
   ≥ 25.0 3,063 (85.1) 536 (14.9) 0.10
   18.5-24.9 7,342 (77.1) 2,183 (22.9) 0.76
   < 18.5 577 (63.8) 328 (36.2) Reference
Waist circumferenceb, cm    
   ≥ 80 (female) or 90 (male) 8,280 (81.8) 1,847 (18.2) 0.06
   < 80 (female) or 90 (male) 2,665 (69.1) 1,180 (31.9) Reference
Second-hand smoke    
   Never 2,149 (69.2) 957 (30.8) < 0.001
   Ever 8,862 (80.9) 2,098 (19.1) Reference
Smoking    
   Current smoker 2,717 (84.5) 498 (15.5) 0.01
   Ex-smoker 604 (92.8) 47 (7.2) 0.78
   Never-smoker 7,383 (75.4) 2,408 (24.6) Reference
Amount of smoking, pack-years 8.0 ± 23.1 2.4 ± 11.2 0.24
  1. Note: The number of subjects may not total 100% (N = 14,068) due to missing.
  2. a Classified by the international classification of adult underweight ( < 18.5), normal (18.5-24.9), and overweight or obese (≥ 25.0) according to WHO cut-off point; b Classified by the Asia-Pacific guidelines for the management of obesity (WHO 2000); c P-value for comparing the difference between ever users versus nonusers, given by logistic regression analysis after adjusting for all potential confounding variables.