Quality of life outcomes in patients undergoing knee replacement surgery: longitudinal findings from the QPro-Gin study

Table 2 Baseline distribution of sf-12 and womac-index according to patients’ characteristics

	(n = 132)	SF 12-PCS		SF 12-MCS		WOMAC-Index
	N (%)	Mean ± SD	P	Mean ± SD	P	Mean ± SD	P
Age			0.318		0.900		0.925
< 65 years	42 (31.8)	34.4 ± 9.3		48.2 ± 12.4		45.9 ± 14.9
≥ 65 years	90 (68.2)	36.1 ± 8.8		48.0 ± 10.5		45.6 ± 16.6
Sex			0.040		0.002		< 0.001
Male	35 (26.5)	38.2 ± 9.4		53.0 ± 10.8		37.4 ± 14.3
Female	97 (73.5)	34.6 ± 8.7		46.3 ± 10.7		48.7 ± 15.6
Education			0.159		0.001		0.009
Low	86 (65.2)	34.8 ± 8.8		45.8 ± 11.3		48.4 ± 16.0
High	46 (34.8)	37.1 ± 9.3		52.3 ± 9.4		40.7 ± 14.9
BMI			0.001		0.635		0.074
< 30 kg/m²	87 (65.9)	37.4 ± 8.5		48.4 ± 11.1		43.9 ± 16.0
≥ 30 kg/m²	45 (34.1)	31.9 ± 8.8		47.4 ± 11.3		49.2 ± 15.6
Depressive symptoms (GDS ≥ 6)			0.005		< 0.001		< 0.001
No	102 (77.3)	36.6 ± 9.2		51.1 ± 9.3		42.7 ± 14.9
Yes	30 (22.7)	31.9 ± 7.3		37.7 ± 10.7		55.8 ± 15.7
Cognitive impairment (MMSE < 24)			0.883		0.663		0.529
No	121 (91.7)	35.5 ± 9.2		48.2 ± 10.8		45.4 ± 16.1
Yes	11 (8.3)	35.9 ± 5.9		46.6 ± 14.7		48.6 ± 14.8
Comorbidity			0.191		0.033		0.699
< 4 diseases	44 (33.3)	37.0 ± 8.9		51.0 ± 10.4		46.5 ± 17.9
≥ 4 diseases	88 (66.7)	34.0.8 ± 9		46.6 ± 11.2		45.3 ± 15.1
Current smoker			0.387		0.828		0.400
No	115 (87.1)	35.3 ± 9.1		48.1 ± 10.7		46.2 ± 15.9
Yes	17 (12.9)	37.3 ± 7.7		47.5 ± 13.7		42.6 ± 16.6
Current alcohol user			0.097		0.101		0.005
No	27 (20.5)	33.0 ± 8.0		44.9 ± 10.6		52.1 ± 11.5
Yes	105 (79.5)	36.2 ± 9.1		48.9 ± 11.1		44.1 ± 16.6
Surgery type			0.574		0.159		0.016
UKA	47 (35.6)	36.2 ± 8.2		46.2 ± 11.0		41.2 ± 13.8
TKA	85 (64.4)	35.2 ± 9.4		49.1 ± 11.1		48.2 ± 16.7

Abbreviation: SD standard deviation, SF-12 Short-Form General Health Survey, PCS physical component scores, MCS mental component scores, WOMAC Western Ontario and McMaster Universities Arthritis Index, BMI Body Mass Index, GDS Geriatric Depression Scale, MMSE Mini-Mental State Examination, UKA unicompartmental knee arthroplasty, TKA total knee arthroplasty
SF-12 (PCS, MCS) ranges from 0 [worst] to 100 [best]
WOMAC-Index is normalised to 100, ranges from 0 [best] to 100 [worst]

ISSN: 1471-2474