Table 4.
Subgroup analysis of MetS for the highest vs. lowest dietary selenium level category.
| Stratification | Number of studies | Pooled RR | 95% CI | P- value | Heterogeneity |
|---|---|---|---|---|---|
| All studies | 4 | 0.77 | 0.63, 0.95 | P = 0.01 | P = 0.99; I2 = 0% |
| Study design | |||||
| Cross-sectional | 4 | 0.77 | 0.63, 0.95 | P = 0.01 | P = 0.99; I2 = 0% |
| Cohort | / | / | / | / | / |
| Race | |||||
| Asian | 3 | 0.77 | 0.63, 0.95 | P = 0.02 | P = 0.93; I2 = 0% |
| American | 1 | 0.81 | 0.30, 2.19 | / | / |
| Diagnostic criteria of MetS | |||||
| NCEP ATP III/IDF | 2 | 0.79 | 0.62, 1.00 | P = 0.05 | P = 0.88; I2 = 0% |
| Other | 2 | 0.73 | 0.49, 1.10 | P = 0.14 | P = 0.83; I2 = 0% |
| Sample size | |||||
| <1,000 | 2 | 0.82 | 0.50, 1.34 | P = 0.42 | P = 0.98; I2 = 0% |
| >1,000 | 2 | 0.76 | 0.61, 0.96 | P = 0.02 | P = 0.76; I2 = 0% |
| Exposure assessment | |||||
| FFQ | 1 | 0.72 | 0.46, 1.13 | / | / |
| 24 h or 3 days recall | 3 | 0.79 | 0.62, 0.99 | P = 0.04 | P = 0.99; I2 = 0% |
| Population | |||||
| Adults | 3 | 0.77 | 0.63, 0.95 | P = 0.02 | P = 0.93; I2 = 0% |
| Adolescents | 1 | 0.81 | 0.30, 2.19 | / | / |