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Table 1 Characteristics of social-demographics and major risk factors of NPC cases and controls (%)

From: Household inhalants exposure and nasopharyngeal carcinoma risk: a large-scale case-control study in Guangdong, China

Variables Cases (n = 1845) Controls (n = 2275) P*
Age, years 46.11 ± 10.99 46.42 ± 11.74 0.387
Sex    
 Female 496 (26.88) 665 (29.23)  
 Male 1373 (73.12) 1610 (70.77) 0.096
Education    
 High school or lower 1558 (84.77) 1554 (68.52)  
 College or above 280 (15.23) 714 (31.48) <0.001
Living type    
 Block 671 (37.68) 1070 (47.79)  
 Bungalow 1110 (62.32) 1169 (52.21) < 0.001
Cigarette smoking, pack-years    
 Never-smoker 839 (45.75) 1190 (52.56)  
 <20 406 (22.42) 406 (25.93)
 ≥20 566 (31.25) 487 (21.52) < 0.001
Tea    
 Less than monthly 653 (35.96) 495 (21.80)  
 Monthly 312 (17.18) 634 (27.92)  
 Weekly or more 851 (46.86) 1142 (50.29) < 0.001
Herbal tea    
 Less than monthly 474 (25.85) 427 (18.96)  
 Monthly 725 (39.53) 984 (43.69)  
 Weekly or more 635 (34.62) 841 (37.34) < 0.001
Slow-cooked soup    
 Less than monthly 264 (14.43) 80 (3.55)  
 Monthly 207 (11.32) 232 (10.30)
 Weekly or more 1358 (74.25) 1940 (86.15) < 0.001
Salted fish    
 Less than monthly 1472 (80.22) 2014 (89.15)  
 Monthly 203 (11.06) 122 (5.40)
 Weekly or more 160 (8.72) 123 (5.44) < 0.001
Preserved vegetables    
 Less than monthly 1318 (71.67) 1961 (86.81)  
 Monthly 280 (15.23) 149 (6.60)
 Weekly or more 241 (13.10) 149 (6.60) < 0.001
Family history of NPC    
 No 1537 (83.49) 2075 (94.71)  
 Yes 304 (16.51) 116 (5.29) < 0.001
  1. *T-tests and Chi-Square tests were used to describe certain characteristics between cases and controls