Table 4

Factors associated with childhood immunization research productivity identified by zero-truncated negative binomial regression models.

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

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

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


DTP3, third dose of the diphtheria-tetanus-pertussis vaccine by one year of age; IRR, incidence rate ratio; CI, confidence intervals

Wiysonge et al. BMC Medicine 2013 11:66   doi:10.1186/1741-7015-11-66

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