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Table 2 Association between household inhalants and nasopharyngeal carcinoma risk

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

Exposure factors Case Control OR (95 % CI)a P
Incense use frequency   
 Never 287 572 1.00 (reference) -
 Occasionally 405 647 1.03 (0.83, 1.27) 0.812
 Frequently 1130 1035 1.73 (1.43, 2.09) < 0.001
 P trend b     < 0.001
Mosquito coil use frequency   
 Never 633 841 1.00 (reference) -
 Occasionally 671 816 1.03 (0.88, 1.22) 0.682
 Frequently 497 574 0.97 (0.81, 1.17) 0.764
Cooking frequency    
 Never 862 1041 1.00 (reference) -
 Less than daily 266 365 0.95 (0.77, 1.17) 0.643
 Daily 712 858 1.04 (0.87, 1.23) 0.681
Wood stove use     
 No 585 1135 1.00 (reference) -
 Yes 1260 1140 1.95 (1.65, 2.31) < 0.001
  1. aORs (odds ratios) were adjusted for age (years, continuous variable), sex (male, female), education (high school or less, college or more), housing type (block, bungalow), cigarette smoking pack-years (never smoker, less than 20 pack-years, more than 20 pack-years), salted fish (less than monthly, monthly, weekly or more), preserved vegetables (less than monthly, monthly, weekly or more), tea (less than monthly, monthly, weekly or more), herbal tea (less than monthly, monthly, weekly or more), slow-cooked soup (less than monthly, monthly, weekly or more), family history of NPC (no, yes)
  2. bLinear trends tests were performed by treating ordered categorical variables as continuous variables