Bulletin of the World Health Organization

Forecasting the global shortage of physicians: an economic- and needs-based approach

Richard M Scheffler, Jenny X Liu, Yohannes Kinfu, Mario R Dal Poz

Volume 86, Number 7, July 2008, 516-523

Table 2. Ordinary least squares regression results of needs-based and demand-based models^a

	Needs-based model:% live births attended by a skilled physician^b		Demand-based model:logged physicians per 1000
	Estimated coefficient	Robust standard error	Estimated coefficient	Robust standard error
Logged physicians per 1000	0.204^c	0.010
Logged GNP per capita (t–5)			0.237^c	0.074
Middle-income country			–0.568^c	0.128
Low-income country			–1.565^c	0.182

Country fixed effects	Yes		Yes

N	409		2 513
R²			0.974
Wald-stat (P > χ²)	446.52	0.000
F-stat (P-value)			74.15	0.000

GNP, gross national product.^a Full sample n = 158 countries. Standard errors are clustered at the country level. Regressions are weighted by population size.^b Sin^–1 transformation applied.^c Significant at 1% level.Data source: World development indicators database,¹² World health statistics 2006,¹³ Health nutrition population statistics, OECD health data 2005,¹⁴ 2004 revision population database.¹⁵

Bulletin of the World Health Organization

Forecasting the global shortage of physicians: an economic- and needs-based approach

Richard M Scheffler, Jenny X Liu, Yohannes Kinfu, Mario R Dal Poz

Table 2. Ordinary least squares regression results of needs-based and demand-based modelsa

Table 2. Ordinary least squares regression results of needs-based and demand-based models^a