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Table 3 Results of ordinal logistic regression models of categories of ISI treated as an ordinal outcome stratified by the three pain groups

From: Insomnia severity and its relationship with demographics, pain features, anxiety, and depression in older adults with and without pain: cross-sectional population-based results from the PainS65+ cohort

Variable Μultiple regression weights
Wald OR (95% CI) Nagelkerke R 2
a. Model 1
Chronic pain (n = 2790)
   0.22
 Age (years) 1.013 0.99 (0.97–1.01)  
 Female sex 1.116 1.03 (0.80–1.33)  
 Pain intensity 15.501 1.13 (1.06–1.20)***  
 Pain spreading 8.930 1.04 (1.01–1.06)**  
 GWBS-anxiety 29.452 1.11 (1.06–1.15)***  
 GWBS-depression 11.475 1.09 (1.03–1.14)***  
b. Model 2
Subacute pain (n = 510)
   0.23
 Age (years) 1.189 0.98 (0.93–1.02)  
 Female sex 0.398 0.99 (0.51–1.57)  
 Pain intensity 0.979 1.10 (0.91–1.34)  
 Pain spreading 0.052 1.01 (0.97–1.15)  
 GWBS-anxiety 6.547 1.15 (1.03–1.28)*  
 GWBS-depression 3.398 1.08 (1.01-1.25)*  
c. Model 3
No pain (n = 2905)
   0.41
 Age (years) 0.057 0.99 (0.96–1.01)  
 Female sex 0.187 0.99 (0.76–1.43)  
 Pain intensity NA NA  
 Pain spreading NA NA  
 GWBS-anxiety 6.059 1.13 (1.06–1.18)*  
 GWBS-depression 0.594 1.10 (0.99–1.24)  
  1. ISI Insomnia Severity Index, GWBS general well-being schedule, OR odds ratio, R 2 multiple correlation coefficient squared, NA not applicable
  2. * p < 0.05, ** p < 0.01, *** p < 0.001