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*