Table 2. Correlations among study variables at baseline.
| Variable | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. BDI-II total | — | ||||||||||||
| 2. BDI-II cognitive | .83c | — | |||||||||||
| 3. BDI-II affective | .81c | .57c | — | ||||||||||
| 4. BDI-II somatic | .90c | .54c | .66c | — | |||||||||
| 5. IL-6 (pg/mL) | -.005 | .06 | -.02 | -.05 | — | ||||||||
| 6. CRP (mg/L) | .02 | .05 | -.03 | .02 | .32c | — | |||||||
| 7. sTNF-RII (pg/mL) | .06 | .08 | -.01 | .05 | .12 | .06 | — | ||||||
| 8. BDNF genotype | .02 | .01 | .06 | -.003 | -.02 | -.10 | -.01 | — | |||||
| 9. Age | -.18 | -.18 | -.13 | -.15 | .12 | -.06 | .25b | -.01 | — | ||||
| 10. BMI | .16 | .22a | .13 | .07 | .29b | .36c | .21a | -.03 | .22a | — | |||
| 11. Time since treatment | -.15 | -.09 | -.06 | -.19 | -.16 | -.11 | -.22a | .16 | -.04 | -.08 | — | ||
| 12. Cancer stage | .22a | .12 | .10 | .25b | -.01 | .07 | .28b | -.05 | -.03 | .08 | -.17 | — | |
| 13. Treatment type | .32c | .16 | .20a | .34c | .07 | .10 | .29b | -.06 | -.10 | .008 | -.3c | .62c | — |
| 13. PSQI | .50 c | .34 c | .36 c | .54c | .03 | .04 | .04 | .08 | .08 | -.01 | -.15 | .12 | .21a |
a
p<.05.
b
p<.01.
c
p<.001.
Note. BDNF genotype was dummy coded 0 = Val/Val, 1 = Val/Met or Met/Met. Cancer stage was dummy coded 0 = stage 0, 1 = stage I, 2 = stage II, 3 = stage III. Treatment type was dummy coded 0 = neither radiation nor chemotherapy, 1 = radiation only, 2 = chemotherapy only, 3 = chemotherapy and radiation. Coefficients measuring associations between two continuous variables are Pearson product-moment correlations. Coefficients involving BDNF genotype are point biserial correlations. Coefficients measuring associations between cancer stage and treatment type, or between cancer stage/treatment type and continuous variables, are Spearman's rank-order correlations.