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Table 1 Unit root tests

From: The relationship between the growth in the health sector and inbound health tourism: the case of Turkey

Variables	Augmented Dickey–Fuller (ADF)		Phillips–Perron (PP)
Variables	Constant without trend	Constant with trend	Constant without trend	Constant with trend
Level
ln htour	−2.049449	−2.764120	−1.974959	−2.718319
ln hgdp	−1.107769	−2.711389	−1.125967	−2.697990
ln rer	−2.024238	−2.470090	−2.159688	−2.571869
First difference
∆ ln htour	−8.048863^a	−7.948662^a	−10.29624^a	−13.54837^a
∆ ln hgdp	−7.367436^a	−7.518019^a	−7.326674^a	−7.469352^a
∆ ln rer	−6.565184^a	−6.649881^a	−6.564661^a	−6.654715^a

^aIndicate statistical significance at the 1 %, level

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