(1)

(2)

(3)

(4)

(5)

VARIABLES

N

mean

sd

min

max

GI

3136

0.258

1.537

0

36

Index

3136

2.842

0.895

0.185

4.319

coverage

3136

2.638

0.877

0.0306

3.970

usage

3136

2.906

0.958

0.128

4.887

digitization

3136

3.397

0.992

0.0758

4.622

KZ

3136

−0.169

2.338

−10.55

8.096