The contribution of databases to the results of systematic reviews: a cross-sectional study

Table 1 Mean percent of trials from original meta-analysis found in each database^a

Database	Mean %	Minimum %	Q1 %	Median %	Q3 %	Maximum %
Acute Respiratory Infections (n = 57)
Medline	85	0	79	100	100	100
BIOSIS	65	0	50	67	100	100
CAB Direct	0.3	0	0	0	0	20
CINAHL	22	0	0	0	33	100
EMBASE	80	0	75	100	100	100
ERIC	0.2	0	0	0	0	13
HAPI	0	0	0	0	0	0
IPA	23	0	0	20	42	100
LILACS	0	0	0	0	0	0
PsycINFO	2	0	0	0	0	88
Infectious Diseases (n = 38)
Medline	92	33	86	100	100	100
BIOSIS	67	0	50	68	100	100
CAB Direct	5	0	0	0	0	100
CINAHL	10	0	0	0	17	50
EMBASE	81	20	67	86	100	100
ERIC	0	0	0	0	0	0
HAPI	0	0	0	0	0	0
IPA	17	0	0	1	29	100
LILACS	5	0	0	0	0	100
PsycINFO	3	0	0	0	0	100
Developmental Psychosocial Learning Problems (n = 34)
Medline	75	0	50	100	100	100
BIOSIS	49	0	0	50	88	100
CAB Direct	0	0	0	0	0	0
CINAHL	34	0	0	35	50	100
EMBASE	62	0	25	75	100	100
ERIC	26	0	0	0	50	100
HAPI	0	0	0	0	0	0
IPA	7	0	0	0	0	67
LILACS	3	0	0	0	0	100
PsycINFO	47	0	0	50	90	100

^aPercentages do not match those in Table 2; the percentages here are an average across meta-analyses

ISSN: 1471-2288