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Table 1 Distribution of reviews by reviewer, setting, and level of study design

From: Missing the forest (plot) for the trees? A critique of the systematic review in tobacco control

Level* Setting** N (%)
  Clinical Clinical System Community Mixed Total
COCHRANE      
Level 1 16 (84) 1 (50) 3 (23) 6 (50) 26
Level 2 3 (16) 0 (0) 0 (0) 4 (33) 7
Level 3 0 (0) 0 (0) 5 (38) 2 (16) 7
Level 4 0 (0) 1 (50) 5 (38) 0 (0) 6
All levels 19 (100) 2 (100) 13 (100) 12 (100) 46
GUIDE      
Level 1 0 (0) 0 (0) 4 (33) 0 (0) 4
Level 2 0 (0) 0 (0) 0 (0) 0 (0) 0
Level 3 0 (0) 0 (0) 0 (0) 1 (100) 1
Level 4 0 (0) 5 (100) 8 (67) 0 (0) 13
All levels 0 (0) 5 (100) 12 (100) 1 (100) 18
  1. * Level: Level 1 (only RCTs included in review), Level 2 (At least one quasi-randomized study included in review), Level 3 (At least one controlled trial included in review), Level 4 (At least one non-controlled trial, such as interrupted time series, included in review).
  2. **Setting: Clinical (interventions aimed at individuals in a clinical setting), Clinical system (interventions involving the healthcare system, such as subsidies for cessation medications or provider training), Community (interventions aimed at individuals in the community), or Mixed (included trials involving interventions in two or more of the above).