Sample size needed to test four variables in a multivariable analysis based upon various event rates and the required number of events per variable
| Required number of events per variable | Number of events needed | Sample size needed to test four variables in a multivariable analysis based on various event rates | |
|---|---|---|---|
| 4% | 6% | ||
| 10 | 40 | 1000 | 667 |
| 12 | 48 | 1200 | 800 |
| 15 | 60 | 1500 | 1000 |