Independent variable

β

T

Sig

Internal environmental management

0.288

2.134

0.036^*

Green information systems

0.250

2.541

0.013^*

Green purchasing

0.445

2.804

0.006^*

Cooperation with customers

0.352

3.557

0.001^*

Eco-design and packaging

0.293

3.164

0.002^*

Investment recovery

0.244

2.682

0.009^*