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

Table 1 Distribution of selected characteristics among cases and controls¹

	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 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 Refers to age at diagnosis (cases) and age at interview (controls)

ISSN: 1471-2407