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Combined odds ratios for pre-diabetes studies stratified by study type
| Type of study | No of studies | Combined OR (95% CI) | P value | χ2/df* |
|---|---|---|---|---|
| All | 9 | 3.7 (2.1 to 6.8) | <0.001 | 1.34 |
| Nested case-control studies | 6 | 3.0 (1.5 to 6.0) | 0.002 | 1.57 |
| Studies in Europe | 5 | 5.2 (2.8 to 9.6) | <0.001 | 0.17 |
*Cochrane χ2 divided by degrees of freedom. Values >1 indicate heterogeneity.
