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Table 2 Correlations among variables and results from the linear regression models of ISI total score (continue variable) 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 Correlations with ISI (r) Multiple regression weights R 2
Β β
a. Model 1
Chronic pain (n = 2790)
    0.24
 Age (years) 0.43 −0.017 −0.023  
 Female sex 0.19 0.235 0. 021  
 Pain intensity 0.27*** 0.356*** 0.138***  
 Pain spreading 0.20*** 0.069* 0.075*  
 GWBS-anxiety 0.43*** 0.259*** 0.237***  
 GWBS-depression 0.40*** 0.261*** 0.132***  
b. Model 2
Subacute pain (n = 510)
    0.26
 Age (years) 0.01 −0.039 −0.053  
 Female sex 0.07 0.188 0.018  
 Pain intensity 0.16* 0.246 0.086  
 Pain spreading 0.06 0.010 0.004  
 GWBS-anxiety 0.48*** 0.294* 0.274*  
 GWBS-depression 0.46*** 0.344* 0.246*  
c. Model 3
No pain (n = 2905)
    0.44
 Age (years) 0.21 0.045 0.056  
 Female sex −0.05 −0.061 −0.057  
 Pain intensity NA NA NA  
 Pain spreading NA NA NA  
 GWBS-anxiety 0.66*** 0.747*** 0.581***  
 GWBS-depression 0.53*** 0.136 0.099  
  1. ISI Insomnia Severity Index, GWBS general well-being schedule, r correlation coefficient, B unstandardized regression coefficients, β standardized regression coefficients, R 2 multiple correlation coefficient squared, NA not applicable
  2. * p < 0.05, ** p < 0.01, *** p < 0.001