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Table 2 Number of studies by health outcome and study design

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

  Mortality Morbidity Total
Cardiovascular Cancer Other
Global      
Meta-analysis/Pooled data 4 3 2 0 9
RCT 0 0 0 0 0
Cohort 0 0 0 0 0
Cross-sectional 0 0 0 0 0
Case control 0 0 0 0 0
Case series/report 0 0 0 0 0
Sub-total 4 3 2 0 9
AMEA      
Meta-analysis/Pooled data 0 0 4 0 4
RCT 0 0 0 0 0
Cohort 1 1 0 0 2
Cross-sectional 0 4 2 4 10
Case control 1 0 15 0 16
Case series/report 0 0 2 0 2
Sub-total 2 5 23 4 34
Europe      
Meta-analysis/Pooled data 1 0 2 1 4
RCT 0 0 0 0 0
Cohort 1 0 0 1 2
Cross-sectional 0 0 0 1 1
Case–control 0 0 0 0 0
Case series/report 0 0 0 0 0
Sub-total 2 0 2 3 7
US      
Meta-analysis/Pooled data 1 0 1 0 2
RCT 0 0 0 0 0
Cohort 3 0 0 0 3
Cross-sectional 0 1 0 2 3
Case control 0 0 0 0 0
Case report 0 0 0 0 0
Sub-total 4 1 1 2 8
Total 12 9 28 9 58
  1. Totals for each health outcome and region may include duplication studies that examined more than one health outcome