Table 2.

Details of questionnaire sampling by risk level

Prism risk level (default score range)	Proportion of sample %	Sample (number of patients) for screening in each practice
Level 4 (50 to 100)	20	15
Level 3 (20 to 50)	50	35
Level 2 (10 to 20)	15	10
Level 1 (0 to 10)	15	10
Total sample	100	70