Table 4 DID regression models between significant and non-significant edge areas

Intercept

77.28*** (17.87)

174.05*** (25.19)

248.87*** (38.00)

65.23*** (12.35)

355.72*** (40.29)

487.44*** (44.82)

97.51*** (20.23)

314.25*** (25.21)

439.97*** (31.64)

SIG.EDGE

− 61.12** (22.32)

− 102.79*** (30.66)

− 128.58* (49.97)

− 38.35** (13.80)

− 200.68*** (53.78)

− 202.75** (64.12)

− 35.94 (25.50)

− 102.18** (38.41)

− 95.03* (46.06)

TIME*

SIG.EDGE

(DID estimator)

39.70^ (20.47)

96.40** (29.66)

219.22*** (51.13)

35.01*** (10.53)

157.85*** (47.66)

274.76*** (72.68)

49.88* (20.52)

3.92 (41.03)

− 41.04 (48.86)

N

42

109

110

56

118

104

71

115

138

ρ

0.161*** (0.0481)

0.144*** (0.0279)

0.093** (0.0318)

0.090* (0.0431)

0.127*** (0.0263)

0.120*** (0.0267)

0.067^ (0.0340)

0.104*** (0.0273)

0.139*** (0.0236)