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. Author manuscript; available in PMC: 2014 Apr 2.
Published in final edited form as: Cochrane Database Syst Rev. 2009 Jan 21;(1):CD006093. doi: 10.1002/14651858.CD006093.pub2
Outcome or subgroup title No. of studies No. of participants Statistical method Effect size
1 Quality of the search strategy (post-intervention) 1 10 Std. Mean Difference (IV, Fixed, 95% CI) −0.08 [−1.32, 1.16]
2 Quality of the search strategy (6-month follow up) 1 10 Std. Mean Difference (IV, Fixed, 95% CI) −2.75 [−4.73, −0.77]
3 Mean signs-on 1 46 Std. Mean Difference (IV, Fixed, 95% CI) 0.22 [−0.36, 0.80]
4 Mean logins/month/user 1 165 Std. Mean Difference (IV, Fixed, 95% CI) 0.34 [0.03, 0.65]
5 Mean number of searches 1 193 Std. Mean Difference (IV, Fixed, 95% CI) −0.07 [−0.37, 0.23]