Table 9.

Proper frequency of image quality management for a reading purpose monitor and clinical purpose monitor

Clinical purpose monitor	Once per week	Once per month	Once per year	Others	Total (%)
General CRT Monitor	4 (57.1)	1 (14.3)	1 (14.3)	1 (14.3)	7 (100)
LCD monitor	1 (20.0)	2 (40.0)	0 (0.0)	2 (40.0)	5 (100)
Flat CRT monitor	2 (28.0)	5 (32.0)	1 (8.0)	5 (38.5)	13 (100)
Total (%)	7 (28.0)	8 (32.0)	2 (8.0)	8 (32.0)

Interaction effect using frequency analysis model and crosstabs model. Unit is the number of cases and percentage