The Reliability and Validity of the Brief ICF Core Set in Patients with Chronic Obstructive Pulmonary Disease

Figures & data

Table 1 The Contents of the Brief ICF-COPD Core Set

Component	Code	Category
Body Functions	b440	Respiration functions
	b450	Additional respiratory functions
	b455	Exercise tolerance functions
	b460	Sensations associated with cardiovascular and respiratory functions
Body structures	s410	Structure of cardiovascular system
	s430	Structure of respiratory system
Activity and Participation	d230	Carrying out daily routine
	d450	Walking
	d455	Moving around
	d640	Doing housework
Environment	e110	Products of substances for personal consumption
	e115	Products and technology for personal use in daily living
	e225	Climate
	e260	Air quality

Notes: Adapted from Stucki A, Stoll T, Cieza A, et al. ICF Core Sets for obstructive pulmonary diseases. J Rehabil Med. 2004;36:114–120. © 2004 Taylor & Francis.²⁰

Table 2 Sociodemographic and Clinical Variables (N=100)

Items	N (%)
Sex
Male	69 (69)
Female	31 (31)
Age, range 52–91
<60	8 (8)
60–70	35 (35)
70–80	43 (43)
≥80	14 (14)
BMI (kg/m2)
<18.5	14 (14)
18.5–23.9	53 (53)
24.0–27.9	23 (23)
≥28	10 (10)
Marital status
Married	91 (91)
Divorced/widowed	9 (9)
Mode of residence
Live with spouse/children	96 (96)
Live alone	4 (4)
Education level
Illiterate	4 (4)
Primary school	22 (22)
Middle school	38 (38)
High school	30 (30)
College or above	6 (6)
Financial situation
Income	71 (71)
Children’s allowance	23 (23)
Other allowance	2 (2)
No income or support	4 (4)
Health insurance
Yes	93 (93)
No	7 (7)
Smoking
Current smokers	27 (27)
Ex-smokers	25 (25)
Non smokers	48 (48)
Course of disease
Acute exacerbation of COPD	78 (78)
Stable COPD	22 (22)
GOLD
I	16 (16)
II	50 (50)
III	23 (23)
IV	11 (11)
COPD exacerbation frequency in the last year (M±SD)	1.15 (1.14)
Family history
Yes	33 (33)
No	67 (67)
Complications
Yes	87 (87)
No	13 (13)
Use of drugs
Yes	94 (94)
No	6 (6)
mMRC
0	2 (2)
1	26 (26)
2	19 (19)
3	32 (32)
4	21 (21)
Use of home oxygen
Yes	42 (42)
No	58 (58)

Table 3 The Internal Consistency Reliability of the Total Scale and Three Subscales

Component	Items	Cronbach’s α
Body Functions	4	0.750
Body structures	2	0.640
Activity and Participation	4	0.843
Total	10	0.873

Table 4 Experts’ Rating and CVI Calculation (n=5)

Item*	Expert Ratings^a					I-CVI^b	S-CVI/AVE
	A	B	C	D	E
b440 Respiration functions	4	4	4	4	4	1.00
b450 Additional respiratory functions	4	2	4	4	4	0.80
b455 Exercise tolerance functions	4	4	4	4	4	1.00
b460 Sensations associated with cardiovascular and respiratory functions	4	4	4	4	4	1.00
s410 Structure of the cardiovascular system	4	4	4	4	4	1.00
s430 Structure of the respiratory system	4	4	4	4	4	1.00
d230 Carrying out daily routine	4	4	4	4	4	1.00	0.986
d450 Walking	4	4	4	4	4	1.00
d455 Moving around	4	4	4	4	4	1.00
d640 Doing housework	4	4	3	4	3	1.00
e110 Products or substances for personal consumption	4	4	4	4	4	1.00
e115 Products and technology for personal use in daily living	4	4	4	4	4	1.00
e225 Climate	4	4	4	4	4	1.00
e260 Air quality	4	4	4	4	4	1.00

Notes: ^aRatings of five experts for the 14-item Brief ICF-CPOD Core Set. ^bAccording to the criteria for I-CVI, a scale with an I-CVI value ≥0.78 was considered acceptable. *Items adapted from Stucki A, Stoll T, Cieza A, et al. ICF Core Sets for obstructive pulmonary diseases. J Rehabil Med. 2004;36:114–120.²⁰ © 2004 Taylor & Francis.

Abbreviations: CVI, content validity index; I-CVI, item-level CVI.

Table 5 Confirmatory Factor Analysis Results

Model	IFI	TLI	CFI	RMSEA
Model 1	0.902	0.869	0.898	0.084
Model 2	0.962	0.946	0.961	0.054

Figure 1 The initial confirmatory factor analysis result of the Brief ICF-COPD Core Set (n=100).

Figure 2 The modified confirmatory factor analysis result of the Brief ICF-COPD Core Set (n=100).

Table 6 The Correlation of mMRC Dyspnea Score and COPD Clinical Severity Grade with the Respective Scales of the Brief ICF-COPD Core Set

	mMRC	COPD Clinical Severity Grade
Body Functions	0.582^b	0.316^b
Body Structures	0.458^b	0.177^b
Activity and Participation	0.649^b	0.363^b
Environment	−0.194	−0.250^d
Total	0.616^b	0.253^d

Notes: ^bp<0.01; ^dp<0.05

Abbreviations: mMRC, modified British Medical Research Council; The Brief ICF-COPD Core Set, International Classification of Functioning, Disability, and Health Brief Core Set for Chronic Obstructive Pulmonary Disease; GOLD, Global Initiative for Chronic Obstructive Lung Disease.

Stucki A, Stoll T, Cieza A, et al. ICF Core Sets for obstructive pulmonary diseases. J Rehabil Med. 2004;36:114–120. doi:10.1080/16501960410016794

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