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Table 2 Stratified odds ratio for metabolic syndrome

From: Ferritin levels and risk of metabolic syndrome: meta-analysis of observational studies

Subgroup Number of studies Odds ratio (95% CI) I 2 P-value
Study design     
Prospective cohort 2 1.59 (1.38, 1.82) 0%  
Cross-sectional 12 1.78 (1.51, 2.09) 81%  
Case–control study 1 1.65( 1.43, 1.91) 0% 0.551
Measure of association     
Odds Ratio 13 1.62 (1.47, 1.79) 47%  
Hazard Ratio 2 1.61 (1.49, 1.75) 37% 0.520
Geographic area     
Asian 9 1.67 (1.38, 2.02) 84%  
Europe 4 1.66 (1.50, 1.83) 14%  
American 2 2.41 (1.77, 3.27) 11% 0.239
Adjusted for CRP     
Yes 9 1.92 (1.61, 2.30) 78%  
No 6 1.52 (1.36, 1.69) 41% 0.044
Quality of SCORE statement     
<30 points 4 1.43 (1.27, 1.61) 0%  
≥30 points 11 1.87 (1.62, 2.17) 79% 0.038
Ferritin assay     
RIA 5 1.93 (1.49, 2.51) 85%  
TIA 2 1.53 (1.08, 2.16) 64%  
Others 6 1.56 (1.42, 1.70) 17% 0.091
Study size, population     
<300 4 1.76 (1.512, 2.06) 57%  
≥300 11 1.70 (1.46, 1.98) 78% 0.152
  1. CRP, C-reactive protein; RIA, immunoradiometric assay; TIA, immunoturbidimetric assay.