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Table 3 Quality Ratings Assigned to Studies by Outcome

From: The health impact of smokeless tobacco products: a systematic review

Health outcome Good quality Fair quality Poor quality
Global    
Mortality 1 0 3
Morbidity 2 0 3
Sub-total 3 0 6
AMEA    
Mortality 0 1 1
Morbidity 2 12 16
Sub-total 2 13 17
Europe    
Mortality 0 2 0
Morbidity 2 3 05
Sub-total 2 5 0
US
Mortality 3 1 0
Morbidity 0 2 2
Sub-total 3 3 2
Total 10 22 26
  1. Totals may reflect duplicated studies that examined more than one health outcome. Quality assigned as “good”, “fair” or “poor” utilizing NIH Quality Assessment Tools [8].