Table 7 Robustness test of main effect and intermediary effect when dependent variable is NPS.

Variable	Model 23	Model 24	Model 25	Model 26	Model 27	Model 28
ER		0.347*** (2.87)		0.375*** (3.02)		0.268** (2.13)
GI					0.405*** (3.16)	0.319*** (2.73)
ED
GI × ED
INUU	0.117 (1.34)	0.102 (1.15)	0.171* (1.89)	0.163* (1.73)	0.279** (2.47)	0.155 (1.42)
ES	0.125 (1.41)	0.124 (1.38)	0.175* (1.77)	0.162* (1.70)	0.119 (1.25)	0.132 (1.54)
BA	0.236** (2.38)	− 0.196* (− 1.76)	0.205** (1.97)	− 0.211** (− 2.13)	0.235** (2.18)	0.223** (2.07)
AL	0.116 (1.35)	0.107 (1.02)	0.152 (1.24)	− 0.149 (− 1.17)	0.197* (1.68)	0.187* (1.66)
Individual factor	Control	Control	Control	Control	Control	Control
Time factor	Control	Control	Control	Control	Control	Control
Constant	0.196* (1.92)	0,181* (1.83)	0.241** (2.26)	0.221** (2.12)	0.201** (2.05)	0.218** (2.09)
R²	0.271	0.262	0.327	0.307	0.337	0.267
F	22.07***	20.35***	26.17***	25.06***	23.81***	21. 49***

***, ** and * respectively indicate that the parameter estimation is significant at the levels of 0.01, 0.05 and 0.1. The "t" value is in parentheses.

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