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Specific model used according to the aim of study (if inference).
| Specific model used according aim of study (if inference) | Studies (N=713), n (%) |
| Linear or logistic regression | 396 (55.5) |
| Survival regression | 250 (35.1) |
| Propensity score matching | 140 (19.6) |
| Descriptive–univariate | 83 (11.6) |
| Other | 48 (6.7) |
| Generalized additive model | 24 (3.4) |
| Clustering | 20 (2.8) |
| Natural language processing | 2 (0.3) |
