Table 2.

Cronbach's α coefficient of questionnaire and 10 subscales.

Subscale	Number of items	Cronbach's α
Questionnaire	49	0.83
I	11	0.77
II	5	0.75
III	5	0.73
IV	4	0.65
V	4	0.68
VI	5	0.63
VII	4	0.40
VIII	4	0.52
IX	4	0.47
X	3	0.44