Table 1. Validation study results.

Variable	Concordancea	Milan		Las Palmas de Gran Canaria
		n	%	n	%
Product used	Yes	47	95.9	48	100.0
	No	2	4.1	0	0.0
Dose form (pills, capsules, etc)	Yes	45	91.8	47	97.9
	No	4	8.2	1	2.1
Doses per day	Yes	45	91.8	38	79.2
	No	4	8.2	10	20.8

^aConcordance between both methods: the PFS usage questionnaire and the 6-month usage diary.