Table 3.

Relying on previous reviews (n = 456)

NMAs that relied on previous review(s)	Count (%)
Relying on previous reviews (n = 456)
Yes	78 (17.1)
No	378 (82.9)
Themes of use (n = 78)
Updated literature search of previous systematic review(s)	43 (55.1)
Used literature database of previous systematic review(s)	20 (25.6)
Updated and expanded literature search of previous systematic review(s)	11 (14.1)
Used abstracted data of previous systematic review(s)	3 (3.8)
Updated literature search of previous systematic review(s) and used data from previous reviews	1 (1.3)