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Table 1 The inclusion of a systematic review: (1) included in introduction, (2) available in literature within 12 months of trial commencement but not included and (3) Type of studies included when no systematic review was included in the introduction

From: Are orthodontic randomised controlled trials justified with a citation of an appropriate systematic review?

   N (%)
(1) SR included in introduction Yes 164 (74.5%)
(2) SR available in literature within 12 months of trial commencement but not included Yes 56 (24.5%)
Total 220 (100%)
(3) Type of study included if no SR available In-vitro 8 (9.9)
Interventional 60 (74.1)
Observational 4 (4.9)
No study cited 9 (11.1)
Total 81 (100%)