Reliability and Validity of the Greek QLQ-C30 and QLQ-MY20 for Measuring Quality of Life in Patients with Multiple Myeloma

Table 4

Interscale correlations among QLQ-MY20 scales and with QLQ-C30 scales.

QLQ-MY20 scales	Disease symptoms	Side effects	Future perspectives
Disease symptoms	—	—	—
Side effects	0.50^***	—	—
Future perspectives	−0.24	−0.45^***	—
QLQ-C30 scales
Global health status	−0.33^*	−0.50^***	0.33^*
Physical functioning	−0.48^***	−0.62^***	0.38^**
Role functioning	−0.24	−0.44^***	0.27
Emotional functioning	−0.27	−0.54^***	0.60^***
Cognitive functioning	0.26	−0.43^***	0.20
Social functioning	−0.33	−0.44^***	0.27
Fatigue	0.35^*	0.60^***	−0.45^***
Nausea and vomiting	0.20	0.42^***	−0.14
Pain	0.74^***	0.48^***	−0.20

Negative correlations are an artifact of the scoring procedure.
^∗𝑃<0.05, ^∗∗𝑃<0.01, and ^∗∗∗𝑃<0.001, with Bonferroni adjustment.