Comparison of the classification ratios of four depression rating scales commonly used in Turkey^*

* An early version of this paper was first presented at the International Psychological Applications Conference and Trends (InPACT) in Ljubljana, Slovenia, May 2015.

Figures & data

Table 1. Mean values and reliability coefficients of the scales.

	n	No. of items	Cronbach’s alpha	Minimum	Maximum	Mean	Standard deviation
CES-Depression Scale	340	20	0.90	0	60	17.34	12.18
Beck Depression Inventory	340	21	0.91	0	63	10.29	9.23
The Zung Self-Rating Depression Scale	339	20	0.84	20	76	39.65	10.90
The Hospital Anxiety and Depression Scale-D	340	7	0.85	0	21	5.81	4.64

Table 2. The comparison of groups with below and above means in four scales.

			Beck Depression Inventory		The Zung Self-Rating Depression Scale		The Hospital Anxiety and Depression Scale-D		Total
			BA	AA	BA	AA	BA	AA
CES-Depression Scale	BA	n	157	32	144	45	147	42	189
		%	83.1	16.9	76.2	23.8	77.8	22.2	100.0
	AA	n	47	103	25	125	31	119	150
		%	31.3	68.7	16.7	83.3	20.7	79.3	100.0
Total		n	204	135	169	170	178	161	339
		%	60.2	39.8	49.9	50.1	52.5	47.5	100.0
Beck Depression Inventory	BA	n			148	56	157	48	205
		%			72.5	27.5	76.6	23.4	100.0
	AA	n			21	113	22	112	134
		%			15.7	84.3	16.4	83.6	100.0
Total		n			169	169	179	160	339
		%			50.0	50.0	52.8	47.2	100.0
The Zung Self-Rating Depression Scale	BA	n					133	36	169
		%					78.7	21.3	100.0
	AA	n					44	125	169
		%					26.0	74.0	100.0
Total		n					177	161	338
		%					52.4	47.6	100.0

Note: BA: below-average group; AA: above-average group.

Table 3. Correlation coefficients and inter-correlations of depression scales.

		Beck Depression Inventory	The Zung Self-Rating Depression Scale	The Hospital Anxiety and Depression Scale-D
CES-Depression Scale	r	0.79***	0.80***	0.77***
	n	339	339	339
Beck Depression Inventory	r		0.75***	0.78***
	n		338	339
The Zung Self-Rating Depression Scale	r			0.76***
	n			338

***p < .001.

Figure 1. Comparison of the CES-Depression Scale with other scales’ total scores by ROC curve.

Figure 2. Comparison of the Beck Depression Inventory with other scales’ total scores by ROC curve.

Figure 3. Comparison of the Zung Self-Rating Depression Scale with other scales’ total scores by ROC curve.

Figure 4. Comparison of the Hospital Anxiety and Depression Scale-D with other scales’ total scores by ROC curve.