Skip to main content

Table 4 Joint effects of inhalants and NPC family history on nasopharyngeal carcinoma

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

Exposure factors Without NPC family history Without NPC family history
Case Control OR (95 % CI)a Case Control OR (95 % CI)a
Incense use
 Never 249 534 1.00 (reference) 38 23 3.44 (1.94, 6.10)
 Frequent 932 937 1.72 (1.41, 2.10) 196 58 6.15 (4.32, 8.74)
Synergistic indexb SI = 1.63 (0.80, 3.30)  
Wood stove use
 No 491 1035 1.00 (reference) 91 57 3.67 (2.51, 5.36)
 Yes 1046 1040 1.94 (1.63, 2.32) 213 59 7.39 (5.26, 10.37)
Synergistic indexb SI = 1.77 (1.06, 2.96)  
  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), and slow-cooked soup (less than monthly, monthly, weekly or more)
  2. bThe synergy index for household inhalant exposure and NPC family history