Table 3 Univariate and multivariable meta-regression analysis involving different study characteristics
Study characteristics | Univariate meta-regression analysis | |||
|---|---|---|---|---|
coefficients | 95%CI | P-value | Explained heterogeneity R2 (%) | |
Diagnosis criteria (WHO VS. CDC/ICD) | 5.52 | 1.59 to 9.44 | 0.01 | 20.79 |
Country economic level (ref-High income) | Â | Â | Â | 15.82 |
 low income | 10.85 | 6.57 to15.14 | 0.00 |  |
 Low-middle | 4.75 | 1.42 to 8.08 | 0.01 |  |
 Upper middle | 3.66 | 0.38- 6.94 | 0.03 |  |
Sample size (ref: > 20000) | -5.08 | -7.60 to -2.55 | 0.00 | 17.92 |
Multivariable regression analysis | 14.51 | |||
 Diagnosis criteria (CDC/ICD VS. WHO) | -0.84 | -6.14 to 4.46 | 0.76 |  |
Country economic level (ref-High income) | ||||
 low income | 4.41 | 0.30 to 8.52 | 0.04 |  |
 Low-middle | -0.19 | -3.03 to 2.65 | 0.89 |  |
 Sample size (ref: ≤ 20000) | 3.46 | 0.76 to 6.16 | 0.01 |  |