| Predictability at P= 1.0, % | Na | Recommended P- value | Predictability at this P- value, % | Reduction in predictability, % | P-value at which imbalance occurs |
---|---|---|---|---|---|---|
One variable | ||||||
Two categories | 50.0 | <90 | 0.8b | 45.0 to 48.8 | 1.2 to 5.0 | 0.7 |
 |  | 90 to <200 | 0.7b | 49.0 | 1.0 | 0.6 |
 |  | ≥200 | 0.7b | 49.5 to 49.9 | <1.0 | 0.5 |
Two categories - unequal prevalence | Â | < 80 | 0.9b | 45.0 to 48.8 | 1.4 to 5.0 | 0.8 |
 |  | 80 to <200 | 0.8b | 49.0 | <1.0 | 0.7 |
 |  | ≥200 | 0.7b | 49.0 to 49.9 | <1.0 | 0.5 |
Three categories | Â | <90 | 0.9b | 45.0 to 48.8 | 1.2 to 5.0 | 0.8 |
 |  | 90 to <200 | 0.8b | 49.0 | 1.0 to 1.1 | 0.7 |
 |  | 200 and <300 | 0.7b | 49.0 | 1.0 | 0.6 |
 |  | ≥300 | 0.7b | 49.3 to 49.6 | <1.0 | 0.5 |
Four categories |  | ≤100 | 0.9b | 40.0 to 49.0 | 1.0 to 5.0 | 0.8 |
 |  | 200 and <400 | 0.7b | 49.0 to 49.3 | 0.7 to 1.0 | 0.6 |
 |  | ≥400 | 0.7b | 49.5 to 49.6 | <1.0 | 0.5 |
Two variables | ||||||
Both with 2 categories | 72.0 | 100 | 0.8 | 63.0 | 9.0 | 0.7 |
 |  | 200 | 0.7 | 60.0 | 12.0 | 0.6 |
 |  | ≥300 | 0.7 | 60.0 | 12.0 | 0.5 |
Both with 2 categories - unequal prevalence | Â | <100 | 1.0 | - | - | 0.9 |
 |  | 100 | 0.9 | 68.0 | 4.0 | 0.8 |
 |  | 200 | 0.7 | 60.0 | 12.0 | 0.6 |
 |  | ≥300 | 0.7 | 60.0 | 12.0 | 0.5 |
One with 2 categories, one with 3 categories | Â | 100 | 0.9 | 68.0 | 4.0 | 0.8 |
 |  | 200 to 300 | 0.7 | 60.0 | 12.0 | 0.6 |
 |  | ≥400 | 0.7 | 60.0 | 12.0 | 0.5 |
Both with 3 categories |  | ≤100 | 1.0 | - | - | 0.9 |
 |  | 200 to 300 | 0.7 | 60.0 | 12.0 | 0.6 |
 |  | ≥400 | 0.7 | 60.0 | 12.0 | 0.5 |
Both with 4 categories | 70.0 | ≤100 | 1.0 | - | - | 0.9 |
 |  | 200 | 0.8 | 64.0 | 6.0 | 0.7 |
 |  | 300 to 400 | 0.7 | 60.0 | 10.0 | 0.6 |
 |  | 500 | 0.7 | 60.0 | 10.0 | 0.5 |
Three variables | ||||||
All with 2 categories - equal prevalence | 80.0 | 100 | 0.8 | 68.0 | 12.0 | 0.7 |
 |  | 200 to 300 | 0.7 | 63.0 | 17.0 | 0.6 |
 |  | ≥400 | 0.7 | 63.0 | 17.0 | 0.5 |
All with 2 categories - unequal prevalence | Â | 100 | 0.9 | 74.0 | 6.0 | 0.8 |
 |  | 200 | 0.8 | 69.0 | 11.0 | 0.7 |
 |  | 300 | 0.7 | 63.0 | 17.0 | 0.6 |
 |  | ≥400 | 0.7 | 63.0 | 17.0 | 0.5 |
Four variables | ||||||
All with 2 categories- equal prevalence | 85.0 | 100 | 0.9 | 78.0 | 7.0 | 0.8 |
 |  | 200 | 0.8 | 72.0 | 13.0 | 0.7 |
 |  | 300 to 400 | 0.7 | 65.0 | 20.0 | 0.6 |
 |  | ≥500 | 0.7 | 65.0 | 20.0 | 0.5 |
All with 2 categories- unequal prevalence | Â | 100 | 1.0 | - | - | 0.9 |
 |  | 200 | 0.8 | 72.0 | 13.0 | 0.7 |
 |  | 300 to 400 | 0.7 | 65.0 | 20.0 | 0.6 |
 |  | ≥500 | 0.7 | 65.0 | 20.0 | 0.5 |