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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)