Figure 1
From: Using evidence from different sources: an example using paracetamol 1000 mg plus codeine 60 mg
Relative efficacy: Numbers needed to treat for paracetamol/codeine combinations for at least 50 % pain relief over four to six hours for patients with moderate or severe post-operative pain. The number of patients in the comparison was the number given paracetamol 1000 mg plus codeine 60 mg together with the number given placebo in the data pooled from trials for each combination of paracetamol and codeine where there were at least two trials.