N

Mean

SD

Minimum

Maximum

High-tech firms^b

288

0.0749

0.0362

0.0179

0.1996

Non-tech firms

61

0.0725

0.0378

0.0221

0.2191

T-test of mean difference

t = 4.46 (p < 0.01)

High-R & D firms^a

122

0.0835

0.0388

0.0179

0.2191

Low-R & D firms

227

0.0696

0.0343

0.0202

0.1996

T-test of mean difference

t = 3.45 (p < 0.01)