All patients | Patients with moderate stroke | Patients with mild stroke | |||||||
---|---|---|---|---|---|---|---|---|---|
Treated | Untreated | Total | Treated | Untreated | Total | Treated | Untreated | Total | |
Calculating relative risks of being dead and dependent: | |||||||||
Overall unadjusted treatment effect is 250/1000÷420/1000 = 0.60 | |||||||||
Treatment effect for those with moderate stroke is 100/250÷360/750 = 0.83 | |||||||||
Treatment effect for those with mild stroke is 150/750÷60/250 = 0.83 | |||||||||
So an overall adjusted treatment effect would be 0.83. | |||||||||
Dead or dependent | 250 | 420 | 670 | 100 | 360 | 460 | 150 | 60 | 210 |
Alive and independent | 750 | 580 | 1330 | 150 | 390 | 540 | 600 | 190 | 790 |
Total | 1000 | 1000 | 2000 | 250 | 750 | 1000 | 750 | 250 | 1000 |