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Table 1 Comparison of demographic characteristics and lifestyle factors between hospital and population controls

From: Population versus hospital controls for case-control studies on cancers in Chinese hospitals

Factor

Hospital controls (n = 540)

Population controls (n = 540)

P value a

Age (years)

56.2 (10.6)

56.2 (10.6)

 

Marital status

  

0.64

   Married

499 (92.4)

504 (93.3)

 

   Others

41 (7.6)

36 (6.7)

 

Household size

2.9 (1.1)

3.0 (1.0)

0.20

Education

  

0.50

   No or primary school

46 (8.5)

37 (6.9)

 

   Junior high school

208 (38.5)

219 (40.6)

 

   Senior high school

119 (22.0)

106 (19.6)

 

   Tertiary education

167 (30.9)

178 (33.0)

 

Income (per capita, Yuan/month)

  

0.50

   ≤ 1000

69 (12.8)

80 (14.8)

 

   1001-2000

347 (64.3)

330 (61.1)

 

   ≥ 2001

124 (23.0)

130 (24.1)

 

BMI (kg/m2)

23.7 (3.1)

24.0 (3.3)

0.07

Smoking (≥ 20 packs in lifetime)

98 (18.1)

104 (19.3)

0.70

Years of smoking

5.2 (11.9)

5.1 (11.4)

0.86

Number of cigarettes per day

3.2 (7.7)

3.4 (8.2)

0.59

Quitting smoking

20 (3.7)

12 (2.2)

0.21

Alcohol consumption (ethanol g/day)

6.6 (20.8)

5.6 (16.0)

0.39

Years of green tea drinking

5.1 (9.7)

5.5 (10.2)

0.47

Dried green tea leaves (g/year)

251.0 (539.7)

282.1 (665.8)

0.40

Physical activity (MET hrs/week)

56.4 (49.0)

53.9 (42.8)

0.36

Malignancies in first degree relatives

81 (15.0)

90 (16.7)

0.53

  1. Values expressed as mean (SD) or number (percent).
  2. Abbreviations: BMI, body mass index; MET, metabolic equivalent tasks.
  3. a Two-sided t-test for continuous variables and chi-square test for categorical variables.