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

Table 8 Use of the the search strategy in the update of a healthcare guideline

Care during pregnancy and puerperium guideline^a	Retrieved references (n)	Relevant references (n)	Relevant studies on non-utility measures	Relevant studies on utility measures	Relevant Qualitative research	Precision (%) 95% CI	NNR
Global search strategy	668	19	9	1	9	2.84 (1.83-4.40)	35.2
Patient preferences domain	653	19	9	1	9	2.76^b (1.75-4.31)	36.3^b
Utility values domain	22	2	2	0	0	0	NA

^aSearch period: First cycle from 01/01/2012- 31/08/2014; Second cycle from 01/09/2014 to 28/02/2015; Third cycle from 01/03/2015 to 31/08/2015
^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)

ISSN: 1477-7525