Independent variable

Tangibility

Reliability

Responsiveness

Assurance

Empathy

Global

X

X

O

O

O

Socioeconomic Status

A

B

C+

C

C−

D+

D

E

X

O

X

X

X

X

X

X

X

O

O

X

X

X

X

X

O

O

O

O

O

O

O

O

O

O

O

O

X

X

X

X

O

O

O

O

X

X

X

X

Gender

Female

Male

X

X

X

X

O

O

X

O

O

X