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Table 3 Relationship between dietary habits with Chinese herbs and NPC

From: Traditional Cantonese diet and nasopharyngeal carcinoma risk: a large-scale case-control study in Guangdong, China

Intake frequency * and duration Case/Ctrl OR (95%CI)# P trend
Herbal tea habit    
   Less than monthly (ref) 439/347 1.0  
   Monthly 425/717 0.46(0.38-0.56) < 0.0001
   Weekly or more 369/347 0.84(0.68-1.03)  
Herbal tea (years)    
   Less than monthly (ref) 439/347 1.0  
   1-9 237/237 0.81(0.64-1.03) < 0.0001
   10-19 88/320 0.22(0.16-0.29)  
   ≥20 146/457 0.25(0.19-0.31)  
Slow-cooked soup habit    
   Less than monthly (ref) 313/214 1.0  
   Monthly 39/42 0.49(0.27-0.87) < 0.001
   Weekly or more 996/1184 0.58(0.47-0.72)  
Slow-cooked soup (years)    
   Less than monthly (ref) 313/214 1.0  
   1-9 146/142 0.67(0.50-0.90) < 0.0001
   10-19 310/380 0.53(0.42-0.67)  
   ≥20 250/659 0.22(0.18-0.28)  
  1. * Intake frequency was categorised as follows: less than monthly, < once per month; monthly, once per month to once per week; weekly or more, ≥ once per week; daily, ≥ once per day.
  2. # OR, odds ratio calculated among matched case and control groups, adjusting for sex, age, education, dialect and household type.