Table 4 Results of threshold effect existence test.

From: Threshold effect study on the development of prefabricated buildings for energy conservation and emission reduction in the construction industry

Threshold variable

Threshold model

F value

P value

Threshold

1% significance level

5% significance level

10% significance level

Zpl

Single

98.87***

0.0000

23.4984

15.9294

12.0914

Double

49.36***

0.0033

20.6680

15.0567

11.8799

Third

20.49

0.1600

63.1724

45.5999

30.4397

Zcxl

Single sill

97.83***

0.0000

23.4424

16.2127

12.9027

Double

32.49***

0.0100

25.0560

16.8805

12.3795

Third

24.11

0.5267

79.8325

58.1474

50.6830

Zlsl

Single

7.82

0.3300

20.0080

16.5343

13.2744

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