Table 1

Comparison of cases and controls on demographics and potential confounding factors, NECSS, Canada, 1994-1997

Premenopausal

Postmenopausal



Characteristic

Cases (N = 866)

Controls (N = 845)

P

Cases(1496)

Controls (n = 1617)

P


Age (mean ± SD)

44.8 ± 6.2

43.8 ± 7.6

0.003

62.0 ± 8.5

62.7 ± 8.1

0.03

Education (years) (mean ± SD)

13.5 ± 3.1

13.6 ± 3.3

0.51

11.7 ± 3.4

11.3 ± 3.5

0.0009

Smoking pack-years (mean ± SD)

5.9 ± 9.4

5.8 ± 9.4

0.72

10.5 ± 15.0

8.8 ± 14.4

0.001

Alcohol consumption (drinks/wk) (mean ± SD))

2.9 ± 5.7

2.7 ± 5.1

0.48

3.1 ± 6.7

2.5 ± 5.6

0.01

BMI (kg/m2 ) (mean ± SD)

24.7 ± 5.2

24.5 ± 4.8

0.29

26.1 ± 5.9

25.7 ± 5.5

0.03

Moderate physical Activity (frequency/month (mean ± SD))

15.9 ± 14.9

15.7 ± 14.1

0.67

18.6 ± 15.4

18.0 ± 15.9

0.28

Strenuous physical activity (frequency/month (mean ± SD))

4.8 ± 8.4

4.9 ± 8.0

0.77

3.3 ± 7.8

3.5 ± 8.1

0.42

Total energy intake (kcals/week)

12915 ± 4791

12687 ± 5440

0.35

12965 ± 5333

12775 ± 6997

0.39

Years of menstruation (mean ± SD)

32.0 ± 6.2

30.9 ± 7.7

0.001

33.0 ± 7.7

32.4 ± 7.6

0.02

Age at menarche (mean ± SD)

12.6 ± 1.4

12.8 ± 1.5

0.005

12.8 ± 1.6

13.0 ± 1.7

0.01

Marital status

0.89

< 0.0001

Marred

659

621

1003

1057

Common law

51

44

19

27

Divorced/separated

74

97

136

129

Windowed

16

18

248

340

Single

60

59

86

59

Other

4

4

2

2

No. live birth

0.27

< 0.0001

0-

162

168

230

174

1-

118

107

153

143

2-

366

330

400

395

3-

162

146

338

319

≥ 4

56

93

372

581

Family income adequacy

0.05

0.17

Low

102

111

283

306

Low middle

146

138

234

276

Upper middle

274

259

302

317

High

202

155

217

199

Smoking status

0.72

0.006

Never

409

413

697

826

Ex-smoker

267

221

488

505

Current smoker

190

211

311

286


Pan et al. BMC Cancer 2011 11:372   doi:10.1186/1471-2407-11-372

Open Data