Table 2. Assessment of methodological quality of studies from 2009 to 2018 reviewed by Belsher et al using selected items of PROBAST tool10.
| Study | Events per variable | Handling of missing data | Calibration plot or table comparing predicted vs observed outcome probabilities |
|---|---|---|---|
| Amini et al, 2016 | NR | Expectation maximisation | NR |
| Barak-Corren et al, 2017 | NR | Complete-case analysis | NR |
| Choi et al, 2018 | NR | NR | NR |
| DelPozo-Banos et al, 2018 | NR | NR | NR |
| Ilgen et al, 2009 | NR | NR | NR |
| Kessler et al, 2015 | NR | Nearest neighbour, multiple and rational imputation | NR |
| Kessler et al, 2017 | NR | Nearest neighbour and rational imputation | NR |
| Kessler et al, 2017b | NR | Complete-case analysis | NR |
| McCarthy et al, 2015 | NR | NR | NR |
| Simon et al, 2018 | NR | NR | Tabulated but not reported graphically |
NR, not reported. References in online supplementary file 1.