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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Withdrawn (N = 942)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.