Convergent validity between SF-36 and WHOQOL-BREF in older adults

Castro, Paula Costa; Driusso, Patrícia; Oishi, Jorge

doi:10.1590/S0034-8910.2014048004783

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Sumário

Artigos Originais • Rev. Saúde Pública 48 (1) • Feb 2014 • https://doi.org/10.1590/S0034-8910.2014048004783 copy

Convergent validity between SF-36 and WHOQOL-BREF in older adults

Validade convergente entre o SF-36 e o WHOQOL-BREF em idosos

Validez convergente entre el SF-36 y el WHOQOL-BREF en ancianos

Authorship SCIMAGO INSTITUTIONS RANKINGS

OBJECTIVE

: To compare the reliability and convergent validity of instruments assessing quality of life in Brazilian older adults.

METHODS

: Cross-sectional study of 278 literate, community-dwelling older adults attending a municipal university for the elderly in Sao Carlos, SP, Southeastern Brazil between 2006 and 2008. The Brazilian versions of the SF-36 and WHOQOL-BREF instruments to assess quality of life were compared. Cronbach’s alpha coefficient was used to estimate reliability and Pearson’s correlation for comparison between the two scales.

RESULTS

: Most of participants were women (87.8%) with a mean age of 63.83±7.22 years. Both scales showed an acceptable internal consistency – WHOQOL-BREF Cronbach’s alpha was 0.832 and SF-36 was 0.868. There was a weak (r ≤ 0.6) correlation between the related fields in the two questionnaires.

CONCLUSIONS

: The SF-36 and WHOQOL-BREF are reliable instruments for clinical and research uses in Brazilian older women. To select one, researchers should consider which aspects of quality of life they aim to capture because of weak convergent validity signs. This study’s results indicate that WHOQOL-BREF may be more relevant to evaluate changes in the quality of life of older women because it prioritizes responses to the aging process and avoids focusing on impairment.

Aging; Quality of Life; Reproducibility of Results; Validity of Tests; Evaluation of Research Programs and Tools; Evaluation Studies as Topics

Variable	Mean	SD	Median	Minimum	Maximum	Lower quartile	Upper quartile
SF-36
PF	77.68	18.5	83.50	13.50	98.50	68.50	93.50
RP	68.79	17.9	80.00	30.00	80.00	55.00	80.00
BP	66.60	23.1	70.80	8.80	98.80	49.80	82.80
GH	71.06	19.3	75.75	15.75	98.75	55.75	85.75
VT	65.27	18.1	63.80	13.80	98.80	53.80	78.80
SF	79.52	20.7	86.25	11.25	98.75	61.25	98.75
RE	65.33	24.3	80.00	13.33	80.00	46.67	80.00
MH	68.92	18.0	70.80	18.80	98.80	58.80	82.80
WHOQOL-BREF
Physical	12.95	2.2	13.14	6.29	17.14	11.43	14.86
Psychological	14.94	2.4	15.33	4.00	19.33	13.33	16.67
Social	13.68	2.3	13.33	4.00	20.00	12.00	14.67
Environmental	14.21	2.4	14.50	6.50	20.00	12.50	16.00
Overall	15.26	2.8	16.00	4.00	20.00	14.00	16.00

	WHOQOL-BREF

Variable	Q1	Q2	Physical	Psycol	Social	Environ	Overall
SF-36
PF	0.21^a	0.33^a	0.58^a,b	0.35^a	-0.10	0.32^a	0.32^a,b
RP	0.27^a	0.31^a,b	0.48^a,b	0.22^a	-0.12^a	0.27^a	0.34^a,b
BP	0.23^a	0.34^a	0.51^a	0.22^a	-0.19^a	0.26^a	0.34^a,b
GH	0.31^a	0.41^a,b	0.55^a	0.29^a	-0.15^a	0.29^a	0.42^a,b
VT	0.40^a	0.48^a	0.64^a	0.45^a	-0.03	0.36^a	0.51^a,b
SF	0.29^a	0.31^a	0.44^a	0.43^a	0.17^a,b	0.31^a	0.35^a,b
RE	0.16^a	0.23^a	0.33^a	0.23^a,b	0.01	0.22^a	0.23^a,b
MH	0.46^a	0.41^a	0.55^a	0.54a	0.12	0.39^a	0.50^a,b

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E-mail: revsp@usp.br

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[1] Correspondence
: Paula Costa Castro. Departamento de Gerontologia – UFSCar. Rod. Washington Luis, km 235. Caixa Postal 676. 13565-905 São Carlos, SP, Brasil. E-mail: castro@ufscar.br