. 2013 Dec 19;9:41–50. doi: 10.2147/COPD.S52700

Table 4.

Predictors of health-related quality of life at baseline and at one-year follow-up by hierarchical regression analysis (N=60)

Variable	Baseline PCS			One-year PCS
Variable	r	B1	B2	r	B1	B2
Consequences	−0.57^a	−0.30^a	−0.35^a	−0.56^a	−0.38^a	−0.41^a
Identity	−0.66^a	−0.49^a	−0.47^a	−0.53^a	−0.32^b	−0.31^b
Explained variance^d		49.1%			38.1%
Self-efficacy	0.12		−0.17	0.04		−0.09
R² change^c			2.7%			0.7%
Explained variance^d			51.8%			38.7%
Variable	Baseline MCS			One-year MCS
Variable	r	B1	B2	r	B1	B2

Timeline	0.25	0.21	0.20	0.06	0.08	0.07
Treatment control	−0.28^b	−0.19	−0.17	0.09	0.15	0.16
Emotional response	−0.44^a	−0.42^a	−0.35^a	−0.31^b	−0.33^b	−0.30^b
Explained variance^d		28.9%			11.8%
Self-efficacy	0.26^b		0.18	0.12		0.07
Social support	0.30^b		0.25^b	0.19		0.17
R² change^c			9.2%			3.1%
Explained variance^d			38.1%			14.9%

Notes: Higher scores on PCS and MCS reflect higher HRQoL. At both time points, illness perception variables were entered as independent variables in the first block (B1), whereas self-efficacy (for PCS) and self-efficacy and social support (for MCS) were entered as additional independent variables in the second block (B2). Table content is bivariate correlation coefficients (Pearson’s r) and standardized beta coefficients (β).

P<0.01

P<0.05

R² change is the amount of variance in the dependent variable accounted for by the second block of independent variables

explained variance is the total amount of variance explained by the models.

Abbreviations: HRQoL, health-related quality of life; MCS, quality of life mental component score; PCS, quality of life physical component score.