Recent meta-analyses neglect previous systematic reviews and meta-analyses about the same topic: a systematic examination

Table 3 Results of the regression analysis

Study characteristic	OR (95% CI)	P -value
*Cited*
Impact factor	1.49 (1.06 to 2.10)	0.021
Publication year	1.19 (1.03 to 1.37)	0.018
Concordance of results	0.92 (0.46 to 1.86)	0.814
Meta-analytic method used	1.41 (0.45 to 4.46)	0.549
Similarity of the review question	0.99 (0.94 to 1.05)	0.789
AMSTAR score	1.10 (0.79 to 1.53)	0.569
*Described*
Impact factor	1.83 (1.27 to 2.62)	0.001
Publication year	1.29 (1.08 to 1.55)	0.006
Concordance of results	0.38 (0.17 to 0.88)	0.023
Meta-analytic method used	3.42 (0.82 to 14.34)	0.092
Similarity of the review question	1.01 (0.94 to 1.08)	0.757
AMSTAR score	1.00 (0.99 to 1.00)	0.136
*Discussed*
Impact factor	1.72 (1.16 to 2.55)	0.007
Publication year	1.55 (1.17 to 2.06)	0.002
Concordance of results	0.40 (0.14 to 1.12)	0.081
Meta-analytic method used	32.36 (2.00 to 522.85)	0.014
Similarity of the review question	0.92 (0.83 to 1.02)	0.116
AMSTAR score	0.76 (0.43 to 1.34)	0.345

Associations between characteristics of the previous studies and odds to be cited, described, and discussed by the recent meta-analyses (as well as the AMSTAR score of the recent articles). Statistically significant results (P ≤ 0.05) are highlighted in bold. CI, confidence interval; OR, odds ratio.

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