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Table 7 Correlation between quality of life scores and the first two first axis of principal component analysis on prospective measures

From: Item response theory and factor analysis as a mean to characterize occurrence of response shift in a longitudinal quality of life study in breast cancer patients

Scores T1: baseline T2: after surgery T3: 3 months T4: six months
First axis Second axis First axis Second axis First axis Second axis First axis Second axis
QLQ-C30 (N = 192)         
GHS -0.74 0.17 -0.72 -0.06 -0.79 -0.09 -0.79 0.03
Physical functioning -0.76 -0.33 -0.76 0.01 -0.79 0.11 -0.81 0.03
Role functioning -0.85 -0.22 -0.81 -0.05 -0.85 -0.05 -0.87 0.01
Emotional functioning -0.46 0.71 -0.56 0.33 -0.68 0.31 0.73 0.23
Cognitive functioning -0.57 0.34 -0.69 0.01 -0.67 0.34 -0.70 0.23
Social functioning -0.71 -0.01 -0.70 0.13 -0.79 -0.01 -0.86 0.06
Fatigue 0.84 0.03 0.85 -0.01 0.90 0.02 0.87 0.02
Nausea and vomiting 0.63 0.01 0.56 0.18 0.46 0.70 0.40 0.69
Pain 0.77 0.19 0.81 0.07 0.69 -0.33 0.75 -0.02
Dyspnea 0.66 0.35 0.55 0.22 0.62 -0.14 0.67 -0.09
Insomnia 0.41 -0.63 0.54 -0.38 0.63 -0.15 0.63 -0.23
Appetite loss 0.51 -0.43 0.65 -0.11 0.61 0.46 0.48 0.66
Constipation 0.36 0.12 0.25 -0.42 0.44 0.37 0.42 0.25
Diarrhea 0.24 0.13 0.17 0.66 0.32 0.27 0.32 0.04
Financial difficulties 0.40 0.49 0.31 0.64 0.44 -0.11 0.38 -0.16
QLQ-BR23 (N = 154)     
Body image -0.70 0.47 -0.64 0.45 -0.79 0.07 -0.79 0.25
Sexual functioning 0.30 -0.44 0.24 -0.52 0.31 -0.51 0.41 -0.41
Future perspective -0.31 0.46 -0.53 0.52 -0.76 0.25 -0.73 0.30
Systemic therapy side effects 0.78 -0.01 0.72 0.28 0.61 -0.49 0.67 -0.21
Breast symptoms 0.58 0.49 0.64 0.38 0.56 0.66 0.57 0.64
Arm symptoms 0.66 0.49 0.75 0.32 0.69 0.44 0.63 0.57