Predictors of taking adherence
| Predictor of dosing adherence | Coefficient (dimensionless) | p-value |
| Univariate analyses | ||
| Individual predictors measured only at baseline | ||
| Age | 0.88 | 0.63 |
| Marital status | −0.23 | 0.85 |
| Health literacy | 0.00 | 1 |
| Individual predictors measured longitudinally with time as covariate | ||
| Time | −1.23 | 0.01 |
| Intention to be adherent | −1.89 | 0.52 |
| Time | −0.97 | 0.04 |
| Number of side-effects reported | −0.55 | 0.57 |
| Time | −0.96 | 0.04 |
| Self-reported omission of pirfenidone | −1.41 | 0.02* |
| Time | Not converged | |
| Depression | ||
| Time | −1.02 | 0.04 |
| Barriers to adherence | −0.43 | 0.43 |
| Time | −1.05 | 0.11 |
| Knowledge about pirfenidone | 2.12 | 0.03* |
| Prediction models (multivariate analyses) | ||
| Model with predictors measured only at baseline | ||
| Age | 1.12 | 0.57 |
| Marital status | −0.37 | 0.78 |
| Health literacy | 0.01 | 0.99 |
| Model with predictors measured longitudinally | ||
| Time | −1.21 | 0.04* |
| Intention to be adherent | Not selected | |
| Number of side-effects reported | Not selected | |
| Self-reported omission of pirfenidone | −1.60 | 0.02* |
| Depression | 0.04 | 0.98 |
| Barriers to adherence | Not selected | |
| Knowledge about pirfenidone | Not selected | |
The variables which were not selected did not sufficiently improve the quality of the model. *: significance at the 0.05 level.