Table 4.  Median and inter quarter range on GHQ30 (n = 11).

	Pre				Post				Z	P	Effect size r
	Median	Inter quarter range			Median	Inter quarter range
Sub-Scale
General disease tendency	1.0	0.0	–	2.0	1.0	0.0	–	2.0	0.11	0.914	0.03
Physical symptoms	1.0	0.0	–	2.0	0.0	0.0	–	1.0	0.95	0.341	0.29
Sleeplessness	1.0	0.0	–	3.0	1.0	0.0	–	1.0	1.19	0.236	0.36
Social activity disorder	0.0	0.0	–	2.0	0.0	0.0	–	1.0	2.00	0.046*	0.60
Anxiety/caprice	3.0	1.0	–	4.0	1.0	0.0	–	3.0	2.20	0.028*	0.66
Depressive tendency	0.0	0.0	–	0.0	0.0	0.0	–	0.0	1.00	0.317	0.30
Total	7.0	6.0	–	9.0	3.0	1.0	–	7.0	1.74	0.083	0.52

Data with missing values and data that did not meet the criteria for attendance and level of achievement were excluded from the analysis. *P < 0.05.