Mean

SD

1

2

3

4

5

6

1. Online healthcare sales

64.50

122.82

2. User review valence

4.14

0.29

0.46

3. User review volume

99.18

157.55

0.58

0.63

4. Hospital dummy

0.74

0.44

−0.10

−0.16

−0.09

5. Activity of doctors

17.46

76.42

0.17

0.14

0.21

−0.03

6. Critic rating of doctors

3.23

0.80

0.03

0.18

0.18

−0.01

0.03