Table 3.

Regression analyses: percentages of variance on the QLQ-C30 functioning scales and global health scale explained by age, illness stage, functioning at baseline, and illness perceptions

Step and variablea	Beta	Summarized R2 (%)	R2 change (%)	F of change (p value)
Physical functioning
1. Age		3%	3%	NS
Illness stage
2. Physical functioning T1	0.60	50%	47%	***
3. Consequences	−0.19	54%	4%	*
Behavioral attributions	−0.18	56%	3%	*
Role functioning
1. Age		1%	1%	NS
Illness stage
2. Role functioning T1		9%	8%	NS
3. Illness identity	−0.44	24%	15%	***
Behavioral attributions	−0.26	32%	9%	**
Consequences	−0.22	36%	4%	*
Emotional functioning
1. Age		1%	1%	NS
Illness stage
2. Emotional functioning T1	0.65	42%	42%	***
Social functioning
1. Age		2%	2%	NS
Illness stage
2. Social functioning T1	0.29	27%	26%	***
3. Illness identity	−0.50	50%	23%	***
Behavioral attributions	−0.22	55%	5%	*
Cognitive functioning
1. Age		1%	1%	NS
Illness stage
2. Cognitive functioning T1	0.78	64%	64%	***
3. Timeline chronic	−0.15	67%	2%	*
Global health
1. Age		4%	4%	NS
Illness stage
2. Global health T1	0.23	35%	31%	***
3. Illness identity	−0.39	48%	14%	***
Behavioral attributions	−0.25	55%	7%	**
Consequences	−0.18	58%	3%	*

^a Illness perceptions dimensions entered for the prediction of the QLQ-C30 functioning scales included: physical functioning: identity, consequences, and behavioral attributions; role functioning: identity, consequences, and behavioral attributions; emotional functioning: identity, consequences, emotional representations, and stress attributions; cognitive functioning: identity, timeline chronic, timeline cyclical, consequences, emotional representations, and stress attributions; social functioning: identity, timeline cyclical, consequences, illness coherence, emotional representations, behavioral attributions, stress attributions; global health: identity, timeline chronic, consequences, emotional representations, behavioral attributions, and stress attributions

NS nonsignificant

*p < 0.05; **p < 0.01, ***p < 0.001