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Table 1 Distribution of selected characteristics among cases and controls1

From: Effect of MDM2 SNP309 and p53 codon 72 polymorphisms on lung cancer risk and survival among non-smoking Chinese women in Singapore

  Cases (n, %) Controls (n, %)
Age in years2 (Mean ± S.D.) 62.0 ± 13.7 63.4 ± 12.3
Years of formal education (Mean ± S.D.) 3.5 ± 4.2 3.8 ± 4.8
Servings of fruit weekly (median, IQR) 3.9, 6.8 7.8, 10.1
Servings of vegetable weekly (median, IQR) 18.1, 16.0 20.6, 20.1
Birthplace   
   Singapore/Malaysia 82 (65.1) 130 (80.2)
   China/other 44 (34.9) 32 (19.8)
Exposure to environmental tobacco smoke at home   
   Daily 46 (36.5) 72 (44.4)
   Weekly < daily 16 (12.7) 15 (9.3)
   Less than weekly 64 (50.8) 75 (46.3)
Histological subtype   
   Squamous/small cell carcinoma 14 (11.9)  
   Adenocarcinoma 85 (72.0)  
   Large cell undifferentiated/Not otherwise specified 19 (16.1)  
  1. 1 All participants are Chinese women, cases and controls frequency-matched for age. A total of 126 cases and 162 controls were eligible, of which 123 and 159, respectively, were successfully genotyped.
  2. 2 Refers to age at diagnosis (cases) and age at interview (controls)