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Table 1 Numbers of papers remaining after each stage of the selection process of the systematic review

From: Osteoarthritis and nutrition. From nutraceuticals to functional foods: a systematic review of the scientific evidence

Raw hits from all sources 2,026
Number of studies reviewed for inclusion criteria after reading the title 121
Number of studies excluded because: administration was not oral
of pharmacological interventions
they did not report the result of a clinical trial
clinical trials were not randomised
results already reported in another paper (duplicate reports)
-23
-13
-30
-2
-2
Number of RCTs found during the reviewing process by serendipity and added to the review +2
Number of RCTs matching inclusion criteria and reviewed here 53
Number of negative RCTs that concerned nutritional intervention for which no positive RCT was found -11
Number of RCTs the quality of which was scored (Table 3) 42