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The effect of adding trajectories on the model performance decreased as the comprehensiveness of the model increased. Such impact was most apparent in statistical indicators and the mean costs of the predicted groups, while ignorable or detrimental in trend ratio and proportions of true cases identified by models.

Therefore, when the baseline model did not include utilization measures, such as the demographics model, adding morbidity trajectories would help increase the model performance; on the contrary, when the baseline model included utilization measures, such as the prior cost model, the contribution from adding morbidity trajectories might become minimal due to the overlap of both variables.