Outcome variable | Regression model | IRR* (95% CI) | p-value |
---|---|---|---|
Number of subsequent visits | Negative binomial regression | 1.19† (1.01–1.41) | 0.038 |
Number of referrals | Negative binomial regression | 0.97† (0.71–1.32) | 0.845 |
Number of investigations | Negative binomial regression | 1.68† (1.26–2.24) | >0.001 |
Note: IRR = incidence rate ratio, CI = confidence interval.
↵* Fatigue symptom patient group designated as the reference group.
↵† IRR adjusted for matched variables (age, age2, sex, practice number, provider number and quarter of index visit) and remaining covariates (number of previous and co-occurring chronic morbidities, number of previous and co-occurring psychosocial morbidities and previous care-seeking frequency).