Skip to main content
. 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
r B1 B2 r B1 B2
Consequences −0.57a −0.30a −0.35a −0.56a −0.38a −0.41a
Identity −0.66a −0.49a −0.47a −0.53a −0.32b −0.31b
 Explained varianced 49.1% 38.1%
Self-efficacy 0.12 −0.17 0.04 −0.09
R2 changec 2.7% 0.7%
 Explained varianced 51.8% 38.7%
Variable Baseline MCS
One-year MCS
r B1 B2 r B1 B2

Timeline 0.25 0.21 0.20 0.06 0.08 0.07
Treatment control −0.28b −0.19 −0.17 0.09 0.15 0.16
Emotional response −0.44a −0.42a −0.35a −0.31b −0.33b −0.30b
 Explained varianced 28.9% 11.8%
Self-efficacy 0.26b 0.18 0.12 0.07
Social support 0.30b 0.25b 0.19 0.17
R2 changec 9.2% 3.1%
 Explained varianced 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).

a

P<0.01

b

P<0.05

c

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

d

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.