Table 3. Analysis of each item for the questionnaire .

Items	Mean if this item is removed	Squared multiple correlation	Item correlation correction	Cronbach's alpha if the item is removed
OGSAS1	19.5829	73.406	0.630	0.777
OGSAS2	19.7005	75.888	0.474	0.791
OGSAS3	19.5936	74.630	0.512	0.787
OGSAS4	19.6203	79.430	0.330	0.803
OGSAS5	19.6631	73.364	0.568	0.782
OGSAS6	19.6203	71.871	0.594	0.779
OGSAS7	19.5775	79.192	0.357	0.801
OGSAS8	19.6203	74.527	0.537	0.785
OGSAS9	19.1176	80.760	0.256	0.810
OGSAS10	19.2888	84.142	0.129	0.802
OGSAS11	19.5936	73.350	0.561	0.782
OGSAS12	19.7273	75.264	0.508	0.788