Table 3.

D-study reliability estimates and variance components for the Person (P) × Item (I) : Country (C) design including interactions for the Stroke Riskometer with removing some countries or some items at a time.

Randomly removed	P	(I:C)		P × (I:C)		Gr	Ga
	σ2	σ2	%	σ2	%
2 countries	0.003	0.000	18.7	0.001	81.3	0.80	0.76
3 countries	0.003	0.000	18.9	0.001	81.1	0.80	0.76
6 countries	0.003	0.000	19.2	0.001	80.8	0.72	0.67
4 items	0.004	0.000	20.1	0.001	79.9	0.81	0.79
8 items	0.003	0.000	18.3	0.001	81.7	0.78	0.74
12 items	0.004	0.001	17.9	0.003	82.1	0.59	0.55