Table 4 Factors associated with childhood immunization research productivity identified by zero-truncated negative binomial regression models.
| Â | Univariable | Multivariable | ||
|---|---|---|---|---|
Variable | IRR (95% CI) | P-value | IRR (95% CI) | P-value |
DTP3 coverage | 0.38 (0.04, 3.42) | 0.389 | not included | Â |
Gross domestic product (US dollar) | 1.46 (1.23, 1.73) | 0.000 | 1.55 (0.82, 2.93) | 0.177 |
Adult literacy rate | 1.21 (0.36, 4.09) | 0.764 | not included | Â |
Physicians per 100,000 population | 1.27 (0.92, 1.74) | 0.147 | 0.77 (0.56, 1.04) | 0.089 |
Total expenditure on health | 3.98 (0.97, 16.21) | 0.054 | 0.68 (0.12, 3.94) | 0.665 |
Private expenditure on health | 3.18 (1.62, 6.22) | 0.001 | 3.64 (1.46, 9.07) | 0.006 |
Research and development expenditure | 1.47 (1.21, 1.78) | 0.000 | 0.96 (0.49, 1.87) | 0.897 |
Human development index | 2.65 (0.45, 15.57) | 0.280 | not included | Â |