Psychometric properties and modification of the 15-item geriatric depression scale among Chinese oldest-old and centenarians: a mixed-methods study

Zhang, Chi; Zhang, Hao; Zhao, Minghao; Chen, Chen; Li, Zhongquan; Liu, Deping; Zhao, Yali; Yao, Yao

doi:10.1186/s12877-022-02833-x

Table 2 Internal consistency and content validity of the GDS-15

From: Psychometric properties and modification of the 15-item geriatric depression scale among Chinese oldest-old and centenarians: a mixed-methods study

Item	Content	Total sample (N =1624)		Oldest-old sample (N =786)		Centenarian sample (N =838)		Applicability score ^a (N =19)		Delete selected ^b (N =18)
Item	Content	α	ITC	α	ITC	α	ITC	Mean	SD	Delete selected ^b (N =18)
1	Are you generally satisfied with your life?	0.736	0.401	0.704	0.325	0.761	0.396	3.56	1.16	7 (18)
2	Have you given up many of your activities and hobbies?	0.729	0.522	0.680	0.534	0.762	0.439	2.39	1.12	14 (18)
3	Do you find life boring or empty?	0.710	0.651	0.673	0.571	0.736	0.667	4.28	1.00	3 (18)
4	Do you often feel bored?	0.726	0.519	0.683	0.509	0.753	0.506	4.56	0.69	0 (18)
5	Are you in good spirits most of the time?	0.741	0.418	0.701	0.350	0.752	0.528	4.50	1.02	1 (18)
6	Are you afraid something bad is going to happen to you?	0.723	0.556	0.689	0.470	0.748	0.564	3.94	1.20	4 (18)
7	Are you happy most of the time?	0.742	0.410	0.712	0.330	0.751	0.540	4.33	0.89	3 (18)
8	Do you ever feel like no one is helping you?	0.736	0.406	0.695	0.417	0.761	0.383	3.17	1.09	11 (18)
9	Do you prefer to stay at home, rather than going out?	0.750	0.354	0.718	0.331	0.779	0.374	1.94	0.81	17 (18)
10	Do you feel you have more problems with memory than most?	0.734	0.462	0.697	0.425	0.761	0.447	2.89	1.05	10 (18)
11	Do you think it is wonderful to be alive now?	0.727	0.505	0.688	0.471	0.751	0.522	3.61	1.05	5 (18)
12	Do you feel worthless?	0.713	0.637	0.671	0.609	0.743	0.608	4.06	0.93	1 (18)
13	Do you feel full of energy?	0.739	0.422	0.711	0.361	0.758	0.456	3.83	0.97	3 (18)
14	Do you feel that your situation is hopeless?	0.722	0.565	0.682	0.519	0.745	0.593	3.89	1.06	3 (18)
15	Do you think that most people are better off than you are?	0.747	0.354	0.719	0.322	0.766	0.392	2.78	1.06	12 (18)
	GDS-15	0.745	0.479	0.713	0.436	0.776	0.488

GDS geriatric depression scale; α: Cronbach’s alpha coefficient of the GDS when one item was deleted, ITC item-total correlation coefficient
^a Score of applicability for 15 items from 19 experts, ^b Selection of the removal of 15 items from 18 experts

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ISSN: 1471-2318

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