Table 5.

Tests for threshold effects between GDP and public health in the subregion.

Region	Threshold	F-stat	Prob	Crit10	Crit5	Crit1
Eastern China	Single	19.15	0.2767	28.846	33.783	42.218
Central China	Single	39.06***	0.003	24.340	28.557	36.722
	Double	17.06	0.130	17.94	21.582	28.659
Western China	Single	23.97*	0.080	22.174	25.290	32.166
	Double	6.07	0.673	18.096	21.857	28.354

^{*** and *}, respectively, indicate significance at the 1 and 10% levels.