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Table 4 Multivariable logistic regression analysis of the full model and final model in the Training Cohorts

From: A web-based dynamic Nomogram for predicting instrumental activities of daily living disability in older adults: a nationally representative survey in China

Variables Full Modela Final Modelb
RR(95%CI) P value RR(95%CI) P value
Factors Selected
Age (years)     
  60 ~ 1.000 (Reference)   1.000 (Reference)  
  65 ~ 1.255 (1.001 ~ 1.574) 0.049 1.256 (1.002 ~ 1.574) 0.048
  70 ~ 1.789 (1.413 ~ 2.263) <0.001 1.748 (1.414 ~ 2.251) <0.001
  75 ~ 2.553 (1.991 ~ 3.274) <0.001 2.509 (1.975 ~ 3.189) <0.001
Education
  Illiterate 1.000 (Reference)   1.000 (Reference)  
  Primary school 0.897 (0.724 ~ 1.112) 0.323 0.908 (0.734 ~ 1.122) 0.370
  Middle school 0.822 (0.597 ~ 1.133) 0.231 0.825 (0.601 ~ 1.133) 0.235
  High school 0.502 (0.286 ~ 0.881) 0.016 0.500 (0.286 ~ 0.875) 0.015
  College and above 0.340 (0.121 ~ 0.954) 0.040 0.347 (0.124 ~ 0.972) 0.044
Social activity
  Never 1.000 (Reference)   1.000 (Reference)  
  Not regularly 0.953 (0. 723 ~ 1.256) 0.734 0.946 (0.718 ~ 1.245) 0.692
  Almost Weekly 0.726 (0.533 ~ 0.989) 0.043 0.723 (0.531 ~ 0.984) 0.039
  Almost daily 0.786 (0.637 ~ 0.970) 0.025 0.768 (0.624 ~ 0.946) 0.013
Smoking
  Never 1.000 (Reference)   1.000 (Reference)  
  Quit 1.630 (1.226 ~ 2.165) 0.001 1.666 (1.283 ~ 2.163) <0.001
  Less than 20 /day 1.167 (0.858 ~ 1.587) 0.324 1.201 (0.901 ~ 1.601) 0.211
  More than 20 /day 1.500 (1.112 ~ 2.025) 0.008 1.541 (1.175 ~ 2.019) 0.002
Drinking
  Never 1.000 (Reference)   1.000 (Reference)  
  Quit 0.724 (0.538 ~ 0.975) 0.033 0.737 (0.550 ~ 0.987) 0.040
  Less than once/month 0.736 (0.505 ~ 1.072) 0.110 0.744 (0.512 ~ 1.082) 0.122
  More than once/month 0.666 (0.526 ~ 0.842) 0.001 0.681 (0.542 ~ 0.855) 0.001
Self-report health condition
  Very good 1.000 (Reference)   1.000 (Reference)  
  Good 1.206 (0.585 ~ 2.486) 0.612 1.222 (0.593 ~ 2.520) 0.586
  Fair 1.305 (0.657 ~ 2.589) 0.447 1.350 (0.681 ~ 2.679) 0.390
  Poor 1.805 (0.913 ~ 3.569) 0.089 1.857 (0.940 ~ 3.670) 0.075
  Very poor 2.154 (1.070 ~ 4.338) 0.032 2.240 (1.113 ~ 4.507) 0.024
Comorbidity condition
  0 1.000 (Reference)   1.000 (Reference)  
  1 1.112 (0.882 ~ 1.400) 0.369 1.100 (0.874 ~ 1.386) 0.416
   ≥ 2 1.428 (1.144 ~ 1.783) 0.002 1.183 (0.991 ~ 1.413) 0.063
Gait speed 0.493 (0.330 ~ 0.737) 0.001 0.510 (0.342 ~ 0.761) 0.001
Cognitive function 0.925 (0.904 ~ 0.948) <0.001 0.925 (0.903 ~ 0.947) <0.001
Depression
  Normal 1.000 (Reference)   1.000 (Reference)  
  Depression 1.190 (0.992 ~ 1.428) 0.061 1.251 (1.001 ~ 1.563) 0.049
Factors Not Selected
Marital status
  Married/Cohabitated 1.000 (Reference)   NA NA
  Other 0.861 (0.697 ~ 1.062) 0.162 NA NA
Gender
  Male 1.000 (Reference)   NA NA
  Female 0.981 (0.776 ~ 1.240) 0.873 NA NA
duration of night sleep (hours)
  7–8 1.000 (Reference)   NA NA
   < 7 1.031 (0.8597 ~ 1.237) 0.742 NA NA
   > 8 1.244 (0.919 ~ 1.684) 0.158 NA NA
BMI
  Normal 1.000 (Reference)   NA NA
  Underweight 0.902 (0.695 ~ 1.171) 0.440 NA NA
  Overweight 0.836 (0.690 ~ 1.014) 0.069 NA NA
Prediction performance Full Model Final Model
AIC 3770.6 3766.0
C-index (95%CI) 0.716 (0.697 ~ 0.736) 0.715 (0.695 ~ 0.734)
Hosmer-Lemeshow testc χ2 = 8.252 (P value =0.409) χ2 = 5.019(P value =0.756)
  1. All analyses were conducted at a 5% significance level; CI confidence interval
  2. aThe full model incorporated fourteen predictors, including age, gender, marital status, education level, social activity frequency, drinking frequency, smoking frequency, duration of night sleep, BMI, self-report health condition, comorbidity condition, depressive symptoms, cognitive function, and gait speed
  3. bThe final model incorporated ten predictors, including age, education level, social activity frequency, drinking frequency, smoking frequency, self-report health condition, comorbidity condition, depressive symptoms, cognitive function, and gait speed
  4. cThe Hosmer–Lemeshow (H-L) test was used to examine the calibration. A P value > 0.05 was considered well-calibrated