Table 2.
Comparison of the Statistical Association of Financial Strain, Household Income, and Race/Ethnicity With the QOL Measures, From Univariable Linear Regression
| Disease/Dependent Variable/Independent Variable | R2 | Mean Squared Error | F Statistic* |
|---|---|---|---|
| Lung cancer | |||
| SF-12 PCS | |||
| Financial reserves† | 0.027 | 11.05 | 17.4 |
| Household income† | 0.025 | 11.07 | 15.5 |
| Race/ethnicity | 0.005 | 11.18 | 2.3 |
| SF-12 MCS | |||
| Financial reserves† | 0.034 | 11.20 | 21.9 |
| Household income† | 0.023 | 11.27 | 14.3 |
| Race/ethnicity‡ | 0.008 | 11.35 | 3.9 |
| BPI | |||
| Financial reserves† | 0.039 | 23.70 | 26.0 |
| Household income† | 0.025 | 23.88 | 16.2 |
| Race/ethnicity† | 0.014 | 24.01 | 6.8 |
| EORTC QLQ 30 symptom index | |||
| Financial reserves† | 0.046 | 18.53 | 31.2 |
| Household income† | 0.023 | 18.75 | 15.4 |
| Race/ethnicity† | 0.017 | 18.82 | 8.2 |
| EQ-5D | |||
| Financial reserves† | 0.045 | 0.17 | 29.8 |
| Household income† | 0.030 | 0.18 | 19.8 |
| Race/ethnicity† | 0.011 | 0.18 | 5.5 |
| Dyspnea | |||
| Financial reserves† | 0.032 | 29.81 | 20.9 |
| Household income† | 0.041 | 29.66 | 27.8 |
| Race/ethnicity‡ | 0.007 | 30.19 | 3.6 |
| Colorectal cancer | |||
| SF-12 PCS | |||
| Financial reserves† | 0.021 | 10.93 | 16.4 |
| Household income† | 0.026 | 10.91 | 20.5 |
| Race/ethnicity | 0.002 | 11.04 | 1.3 |
| SF-12 MCS | |||
| Financial reserves† | 0.043 | 10.36 | 34.2 |
| Household income† | 0.010 | 10.53 | 8.1 |
| Race/ethnicity† | 0.021 | 10.48 | 12.4 |
| BPI | |||
| Financial reserves† | 0.029 | 22.14 | 23.3 |
| Household income† | 0.021 | 22.23 | 16.6 |
| Race/ethnicity† | 0.015 | 22.30 | 9.1 |
| EORTC QLQ 30 symptom index | |||
| Financial reserves† | 0.039 | 17.80 | 32.4 |
| Household income‡ | 0.006 | 18.10 | 5.1 |
| Race/ethnicity‡ | 0.004 | 18.13 | 2.4 |
| EQ-5D | |||
| Financial reserves† | 0.043 | 0.16 | 35.2 |
| Household income† | 0.021 | 0.16 | 16.8 |
| Race/ethnicity† | 0.012 | 0.16 | 7.3 |
NOTE. Higher values for R2 and F statistics, and lower values for mean squared error, correspond with higher statistical associations.
Abbreviations: BPI, Brief Pain Inventory; EORTC QLQ-30, European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire C30; EQ-5D, EuroQol-5 Dimension; MCS, Mental Component Score; PCS, Physical Component Score; QOL, quality of life; SF-12, 12-Item Short Form Health Survey.
F statistics for financial reserves and income category are comparable because they have the same degrees of freedom; F statistics for race are not comparable with the others because they have different degrees of freedom.
P < .001.
P < .05.