Table 2.

Representation of the scores on "evaluative" instrument A and "discriminative" instrument B in a randomized clinical trial [1]

Instrument A	Time 1	Time 2	Intervention	Time 3	Difference score	Exercise test Result
Subject 1	8	9	Verum	15	+6	Much improved
Subject 2	9	8	“”	15	+7	Much improved
Subject 3	8	9	“”	15	+6	Much improved
Subject 4	9	8	“”	15	+7	Much improved
Subject 5	8	9	Placebo	8	-1	Unchanged
Subject 6	9	8	“”	9	+1	Unchanged
Subject 7	8	9	“”	8	-1	Unchanged
Subject 8	9	8	“”	9	+1	Unchanged
Instrument B	Time 1	Time 2		Time 3	Difference score	Exercise test Result
Subject 1	5	5	Verum	5	0	Much improved
Subject 2	9	9	“”	9	0	Much improved
Subject 3	13	13	“”	13	0	Much improved
Subject 4	17	17	“”	17	0	Much improved
Subject 5	5	5	Placebo	5	0	Unchanged
Subject 6	9	9	“”	9	0	Unchanged
Subject 7	13	13	“”	13	0	Unchanged
Subject 8	17	17	“”	17	0