Table 7

Results of U-test

Lower boundUpper bound
Interval1.0721011.769
Slop0.015−0.017
t-value8.207−2.678
P>|t|7.78e−160.003
Test for U-shape2.681 (t-value)0.003 (P>|t|)

Note(s): *, ** and *** Significant at level of 10%, 5% and 1%, respectively

Source(s): Authors’ own compilation

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