Table 3

Statistical power assuming 664 persons randomised per group (total n=1476 with conservatively estimated 10% attrition)

	Combination of mean accuracy scores for intervention groups
Δ	µ1=0.90 µ2=0.90	µ1=0.90 µ2=0.8975	µ1=0.90 µ2=0.895	µ1=0.90 µ2=0.8925	µ1=0.90 µ2=0.8900
0.020	0.954	0.890	0.780	0.625	0.445
0.025	0.995	0.984	0.954	0.890	0.780
0.030	0.999	0.999	0.995	0.984	0.954