Skip to main content
. 2020 Nov 27;9:272. doi: 10.1186/s13643-020-01528-x

Table 6.

Publication year and journal impact factor, stratified by Abstrackr’s relevance predictions

Study characteristic All studies Correctly predicted as relevant Incorrectly predicted as irrelevant Mean difference (95% CI)a P valueb
Publication year, mean (SD) 2008 (7) 2008 (7) 2006 (10) 1.77 (0.27, 3.26) 0.02
Impact factor, mean (SD) 4.87 (8.49) 4.91 (8.39) 4.61 (9.14) 0.30 (− 1.44, 2.03) 0.74

aMean difference between correctly identified studies and those erroneously excluded

bUnpaired t test