Table 4: Relative risk ratios of the impact of body mass index categories and body mass index changes on disability transitions, São Paulo, Brazil—2000–2006.

VariablesADL IADL NAGI
RRRa95% CIRRR95% CIRRR95% CI

Incidence of disability (reference = remain free of disability)
Age1.10 ***1.11 ***1.05 *
Female1.75 *1.53 2.44 **
Smoking status
 Former smoker0.85 1.14 1.47
 Current smoker1.38 1.45 0.97
Number of chronic conditions1.56 ***1.33 **1.25
Schooling0.97 0.92 0.90
Live alone0.85 0.60 1.01
BMI categories
 Underweight0.92 1.73 *0.93
 Overweight0.72 1.39 1.87
 Obese1.99 *2.38 ***1.22
BMI change
 Loss 1.23 0.99 0.85
 Gain 2.30 *1.97 2.15 *
800737389
BIC′27.469.4028.56
Recovery from disability (reference = remain with disability)
Age0.92 *0.93 *0.95 *
Female0.43 0.41 0.53
Smoking status
 Former smoker0.34 1.40 1.46
 Current smoker1.11 0.69 0.97
Number of chronic conditions0.64 *0.94 0.60 ***
Schooling1.05 1.05 1.03
Live alone0.50 1.03 3.27 **
BMI categories
 Underweight0.49 0.16 0.71
 Overweight0.89 0.76 0.86
 Obese0.42 0.68 0.43 *
BMI change
 Loss 0.52 0.53 1.07
 Gain 0.18 *0.64 0.53
161224572
BIC′31.8791.4585.22

ADL: activities of daily living; IADL: instrumental activities of daily living; RRR: relative risk ratio; CI: confidence interval; BMI: body mass index.
aRelative risk ratios were adjusted by smoking status. Remaining free of disability is the reference category for those who started without disability, and remaining with disability is the reference category for those who had disability in the baseline. Normal weight is the reference category for BMI. Stable weight is the baseline category for weight change. Results for lost in the followup were omitted (available upon request).
*** ; ** ; * .