Patient self-report section of the ASES questionnaire: a Spanish validation study using classical test theory and the Rasch model

Table 4 Convergent, divergent and known-group validity of the ASES-p scale with CMS, SF-36 and Barthel

Spearman correlations		ASES-p total (n = 106)	Function score (n = 112)	Pain score (n = 151)
CMS_O		0.62	0.59	0.45
CMS_R		0.54	0.49	0.41
CMS_NS		0.64	0.59	0.47
CMS_O component
Pain		0.62	0.44	0.56
ADL		0.57	0.53	0.45
ROM		0.46	0.45	0.27
Strength		0.37	0.39	0.23
SF-36v2
Physical functioning		0.59	0.54	0.46
Role Physical		0.60	0.60	0.47
Bodily Pain		0.74	0.67	0.66
General health		0.39	0.37	0.27
Vitality		0.54	0.44	0.40
Social functioning		0.45	0.43	0.35
Role emotional		0.33	0.29	0.34
Mental health		0.39	0.35	0.35
PCS		0.65	0.60	0.52
MCS		0.32	0.29	0.28
Barthel		0.31	0.33	0.22
Known groups	n
CMS_O; median (IQR)
≤ 30	14–24	23 (15, 38)	10 (5, 22)	15 (10, 25)
31–60	57–83	45 (25, 55)	22 (13, 28)	20 (15, 30)
≥ 61	32–39	63 (48, 79)	34 (27, 39)	30 (20, 45)
p-value		<0.0001	<0.0001	<0.0001
PCS; mean (SD)
< 50	91–134	42 (20)	21 (11)	22 (12)
≥ 50	14–14	76 (16)	36 (10)	39 (12)
p-value		<0.0001	<0.0001	<0.0001
Barthel; median (IQR)	n
80–90	11–15	18 (12, 57)	12 (3, 27)	15 (10,30)
95	12–15	39 (22, 60)	23 (10, 27)	15 (15,30)
100	60–79	50 (42, 68)	27 (18, 33)	25 (15,40)
p-value		0.004	0.003	0.019

ADL activities of daily living. ASES-p total ranges between 0–100 points. Function and Pain scores range from 0–50 points each. CMS _O Original Constant-Murley score, CMS _R relative CMS standardized for age and sex, CMS _NS CMS score without the strength component: value range 0–75 points, ADL activities of daily living, ROM range of motion, PCS and MCS physical and mental summary components of the SF-36 respectively. Known-group n: corresponds to the min and max subject frequencies per variable category across all three presented scores. p-values: three group comparisons were performed with Jonckheere-Terpstra test and two group comparisons with Student’s t-test. Analyses were based on available data

ISSN: 1477-7525