Introductory Biostatistics

(b)The odds ratios decrease with increasing age;(c)ORMH¼ 5 :40.

1.23 (a) Weight Group Odds Ratio

< 57 5.00

57–75 2.75

> 75 1.30

(b)The odds ratios decrease with increasing weight;(c)ORMH¼ 2 :78.

1.24 For age at first live birth:

Age Odds Ratio

22–24 1.26

25–27 1.49

28 þ 1.95

General odds ratio is 1.43.

For age at menopause:

Age Odds Ratio

45–49 1.10

50 þ 1.40

General odds ratio is 1.27.

1.25 Results for parts(b)and(c):

For smoking:

Status Odds Ratio

Past 1.24

Current 1.40

General odds ratio is 1.23.

For alcohol:

Status Odds Ratio

Past 1.08

Current 0.87

General odds ratio is 0.88.

ANSWERS TO SELECTED EXERCISES 501