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Table 2 Odds ratios from multinomial logistic model for different types of attrition, compared to response, at Survey 5 in the ALSWH for women born in 1921-26.

From: The impact of attrition on the representativeness of cohort studies of older people

   

Odds Ratio (95% Confidence Interval - bold indicates exclusion of 1)

Risk Factor

N

%

Dead

(N = 2395)

vs. Respondent

Frail

(N = 410)

vs. Respondent

Withdrawn (N = 942)

vs. Respondent

Lost to Follow Up (N = 864)

vs. Respondent

Country of Birth

          

Australia

6893

77.1

1.00

 

1.00

 

1.00

 

1.00

 

Other English speaking

1202

13.5

0.98

(0.84,1.15)

0.97

(0.70,1.33)

0.95

(0.76,1.19)

1.18

(0.95,1.47)

Other

843

9.4

0.95

(0.78,1.16)

1.17

(0.83,1.67)

1.93

(1.55,2.42)

2.03

(1.62,2.54)

Highest Qualification

          

University

377

4.2

1.00

 

1.00

 

1.00

 

1.00

 

Certificate/Diploma

728

8.1

1.24

(0.89,1.72)

1.05

(0.55,2.00)

1.54

(0.89,2.68)

0.81

(0.52,1.27)

Trade/Apprenticeship

327

3.7

1.12

(0.75,1.66)

1.49

(0.73,3.04)

2.27

(1.25,4.13)

1.10

(0.66,1.83)

Any high school

4665

52.2

1.31

(0.99,1.74)

1.19

(0.69,2.05)

2.28

(1.41,3.70)

1.17

(0.81,1.68)

No formal qualification

2841

31.8

1.51

(1.13,2.01)

1.41

(0.81,2.47)

3.54

(2.18,5.76)

1.20

(0.83,1.75)

BMI Classification

          

Acceptable

4487

50.2

1.00

 

1.00

 

1.00

 

1.00

 

Overweight

2959

33.1

0.86

(0.76,0.97)

0.91

(0.72,1.14)

1.07

(0.92,1.25)

1.11

(0.94,1.31)

Obese

1203

13.5

0.91

(0.77,1.07)

0.79

(0.57,1.10)

0.62

(0.48,0.79)

1.09

(0.87,1.37)

Underweight

289

3.2

2.17

(1.62,2.92)

1.72

(1.00,2.97)

1.04

(0.64,1.70)

0.77

(0.43,1.36)

Physical Activity

          

Low to very high

6474

72.4

1.00

 

1.00

 

1.00

 

1.00

 

None or very low

2464

27.6

1.75

(1.55,1.97)

1.08

(0.85,1.38)

1.34

(1.14,1.59)

1.19

(1.00,1.42)

Alcohol Consumption

          

Low-risk drinker

3055

34.2

1.00

 

1.00

 

1.00

 

1.00

 

Non-drinker

3007

33.6

1.38

(1.20,1.58)

1.34

(1.02,1.75)

1.15

(0.96,1.38)

1.13

(0.93,1.37)

Rarely drinks

2576

28.8

1.21

(1.06,1.39)

1.43

(1.09,1.86)

0.92

(0.76,1.10)

1.13

(0.94,1.37)

Risky or high-risk drinker

300

3.4

1.02

(0.76,1.37)

1.31

(0.74,2.32)

0.84

(0.54,1.31)

0.74

(0.46,1.18)

Smoking Status

          

Never smoker

5624

62.9

1.00

 

1.00

 

1.00

 

1.00

 

Ex-smoker

2673

29.9

1.45

(1.29,1.64)

1.10

(0.87,1.39)

1.00

(0.85,1.19)

1.25

(1.06,1.48)

Smoker

641

7.2

2.73

(2.22,3.36)

1.26

(0.80,1.97)

1.26

(0.92,1.72)

1.82

(1.35,2.45)

Self Reported Health

          

Excellent

578

6.5

1.00

 

1.00

 

1.00

 

1.00

 

Very good

2489

27.9

1.11

(0.86,1.42)

0.93

(0.56,1.55)

0.98

(0.73,1.33)

1.10

(0.79,1.53)

Good

3516

39.3

1.57

(1.23,2.01)

1.58

(0.97,2.55)

1.11

(0.83,1.49)

1.29

(0.93,1.78)

Fair

2014

22.5

3.25

(2.52,4.19)

2.88

(1.75,4.74)

1.41

(1.03,1.93)

1.94

(1.37,2.73)

Poor

341

3.8

11.87

(7.92,17.79)

7.14

(3.54,14.41)

1.73

(0.95,3.17)

4.14

(2.38,7.20)

  1. In total 8938 women were included in the model, of which 4327 (48.4%) were respondents. Odds ratio estimates with a 95% confidence interval not including unity are shown in bold.
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