The Psychometric Properties of the Older People's Quality of Life Questionnaire, Compared with the CASP-19 and the WHOQOL-OLD
Table 1
OPQOL, CASP-19, and WHOQOL-OLD distributions. NB. 3 additional OPQOL items were generated by Ethnibus focus groups which were too late to be included in the QoL follow-up survey, but were included in the ONS Omnibus and Ethnibus Surveys.
Ethnibus survey (ethnically diverse British pop. aged 65+)
ONS Omnibus survey (British pop. aged 65+)
QoL follow-up survey (ONS Omnibus sample of British pop. aged 65+ in 1999/2000 refollowed up when aged 74+)
OPQOL TOTAL [ethnibus, ONS Omnibus 35 items; 5-point scale (1–5) range 35–175; QoL followup: 32 items, range 32–160)]
% (n)
% (n)
% (n)
≤ 99 QoL bad as can be
6 (24)
1 (6)
7 (17)
100–119
67 (266)
11 (64)
38 (96)
120–139
25 (100)
52 (289)
43 (108)
140–159
2 (9)
32 (178)
12 (29)
160–175 QoL good as can be
–- (1)
4 (23)
–-
Mean (standard deviation)
114.538 (10.718)
134.730 (14.243)
121.385 (14.048)
Cronbach’s alpha of internal consistency (reliability)
0.748
0.876
0.901
No. responses
400
560
250
Casp-19 TOTAL [19 items; 5-point (0–3) scale range 0–57]
≤19 absence of QoL
–- (2)
1 (5)
n/a
20–29
23 (92)
7 (38)
30–39
68 (271)
27 (158)
40–49
8 (32)
46 (265)
50–57 satisfaction in all domains
1 (3)
19 (107)
Mean (standard deviation)
33.235 (5.103)
41.836 (8.120)
Cronbach’s alpha of internal consistency (reliability)
0.553
0.866
n/a
No. responses
400
573
WHOQOL-OLD TOTAL [24 items; 5-point (1–5) scale range 24–120]
≤69 lowest possible QoL
2 (6)
4 (22)
n/a
70–79
23 (94)
11 (58)
80–89
58 (234)
24 (130)
90–99
15 (59)
40 (182)
100–120 the highest possible QoL
2 (7)
27 (144)
Mean (standard deviation)
83.488 (6.547)
91.925 (11.764)
Cronbach’s alpha of internal consistency (reliability)
0.415
0.849
n/a
N. responses
400
536
n/a: not asked in QoL follow-up survey as additional scales were judged to be too burdensome in the postal administration survey. .
