Unadjusted and adjusted ORs and IRRs based on zero-inflated negative binomial models for the association between literacy at wave 5 and the number of medications at wave 6
| Unadjusted | Adjusted* | |||
| Logistic part† | Negative binomial part† | Logistic part† | Negative binomial part† | |
| OR (95% CI) | IRR (95% CI) | OR (95% CI) | IRR (95% CI) | |
| Health literacy | ||||
| Low (score <4) | 0.39 (0.27 to 0.57) | 1.20 (1.13 to 1.27) | 0.64 (0.45 to 0.91) | 1.01 (0.96 to 1.05) |
| Adequate (score=4) | 1.00 (ref) | 1.00 (ref) | 1.00 (ref) | 1.00 (ref) |
95% CI with robust SEs.
Estimates for covariates are reported in online supplemental appendix 1.
Bold valus are statistically significant.
*Full adjustment for baseline factors at wave 5 (2010/11) and Charlson Comorbidity Index, self-rated health and depression at wave 6 (2012/13).
†The logistic part estimates the probability (ORs) of being certain zero medication whereas the negative binomial part estimates the number of medications (IRRs) among those at risk of medication.
IRR, incidence rate ratio; OR, odds ratio; ref, reference.