Development and use of a content search strategy for retrieving studies on patients' views and preferences

Table 7 Use of the search strategy in the development of a healthcare guideline

Allergic rhinitis in asthma guideline^a	Retrieved references (n)	Relevant references (n)	Relevant studies on non-utility measures	Relevant studies on utiltiy measures	Precision (%) 95% CI	NNR
Global search strategy	1560	33	27	6	2,12 (1.51-2.96)	47,27
Patient preferences domain	1487	31	27	4	1,82^b (1.25-2.63)	55,07^b
Utility values domain	92	7	1	6	6,52c (3.02-13.51)	15,33^c

^aSearch period: from inception until May 1st 2015
^bThe precision for the patient preferences domain is calculated as: (number of non-utility studies + qualitative studies)/number of retrieved references by patient preferences domain. The NNR is calculated as: number of retrieved references by patient preferences domain/(number of non-utility studies + qualitative studies)
^cThe precision the utility values domain is calculated as: number of studies on utility measures/number of retrieved references by utility values domain. The NNR is calculated as: number of retrieved references by utility values domain/number of studies on utility measures

ISSN: 1477-7525