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Table 2 Factors associated with unknown self-rated health (multivariate Poisson regression)

From: Features and impact of missing values in the association of self-rated health with mortality in care homes: a longitudinal study

Variable   PR CI (95%)  
Sex (ref. female)   0.25 (0.10–0.63)  
Age (ref. 65–74 years) 75–84 0.13 (0.04–0.45)  
  ≥85 0.11 (0.005–0.28)  
Educational level (ref. primary or less) Secondary and higher 0.68 (0.22–2.13)  
Pressure ulcer (ref. No)   1.15 (0.64–2.07)  
Disability (Barthel index) 0.76 (0.67–0.86)  
CHP (ref. < 2) ≥2 0.94 (0.75–1.33)  
Dementia (ref. No)   8.03 (3.38–19.03)  
Depression (ref. No)   0.59 (0.23–1.47)  
COPD (ref. No)   0.90 (0.51–1.58)  
Cancer (ref. No)   0.97 (0.48–1.95)  
Diabetes (ref. No)   0.68 (0.33–1.41)  
CHF (ref. No)   0.45 (0.18–1.14)  
  1. PR Prevalence ratio, CI Confidence interval, ref. Reference category, COPD Chronic obstructive pulmonary disease, CHF Congestive heart failure, CHP Chronic health problems (excluding COPD, CHF, cancer, diabetes, dementia and depression)