Table 3.

Tests for threshold effects between GDP and public health.

Threshold variable	Threshold	F-stat	Prob	Crit10	Crit5	Crit1
Lnpgdp	Single	54.700**	0.039	43.261	51.314	68.675
	Double	9.500	0.874	39.115	45.184	58.596

^**indicates significance at the 5% level.