The Association between Databases for Indexing Studies Intended for an Exercise Meta-Analysis of Arthritis Randomized Controlled Trials

Table 1

Indexing of articles from database searches.

Variable	PubMed	EMBASE	CENTRAL	CINAHL	SPORTDiscus	DAO
Initial search
𝑛 (%)	27 (75)	9 (36)	29 (80.6)	11 (30.6)	3 (8.3)	0 (0)
(95% CI)	(57.8–87.9)	(12.1–42.2)	(64.0–91.8)	(16.3–48.1)	(1.8–22.5)	(NA)
Follow-up search
𝑛 (%)	34 (94.4)	31 (86.1)	35 (97.2)	19 (52.8)	6 (16.7)	0 (0)
(95% CI)	(81.3–99.3)	(70.5–95.3)	(85.5–99.9)	(35.5–69.6)	(6.4–32.8)	(NA)
NNR	9	12	16	2	118	NA

Notes: Total number of articles included = 36; CENTRAL: Cochrane Central Register of Controlled Clinical Trials; CINAHL: Cumulative Index to Nursing and Allied Health Literature; DAO: Dissertation Abstracts Online; 𝑛 (%): number and percentage of articles; 95% CI: 95% confidence interval; NNR: Number needed to review, calculated by dividing the total number of citations to review per database divided by the number of studies included from the initial search; NA: not applicable.