Table 3.
Correlation between ΔADC (%) and mean radiation dose and ΔSFR (%)
| Correlation coefficient (r) | Mean radiation dose | ΔuSFR | ΔsSFR | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1m-post-RT | 3m-post-RT | 6m-post-RT | 9m-post-RT | 12m-post-RT | 1m-post-RT | 3m-post-RT | 6m-post-RT | 9m-post-RT | 12m-post-RT | |||
| ΔADC-PGs | 1m-post-RT | 0.467a | −0.042 | – | – | – | – | −0.285 | – | – | – | – |
| 3m-post-RT | 0.420a | – | −0.149 | – | – | – | – | −0.213 | – | – | – | |
| 6m-post-RT | 0.446a | – | – | −0.330 | – | – | – | – | −0.289 | – | – | |
| 9m-post-RT | 0.409a | – | – | – | −0.291 | – | – | – | – | −0.369a | – | |
| 12m-post-RT | 0.371a | – | – | – | – | −0.338 | – | – | – | – | −0.411a | |
| ΔADC-SMGs | 1m-post-RT | 0.143 | −0.087 | – | – | – | – | −0.157 | – | – | – | – |
| 3m-post-RT | 0.239 | – | −0.042 | – | – | – | – | −0.182 | – | – | – | |
| 6m-post-RT | 0.376a | – | – | −0.061 | – | – | – | – | −0.302 | – | – | |
| 9m-post-RT | 0.405a | – | – | – | −0.322 | – | – | – | – | −0.322 | – | |
| 12m-post-RT | 0.447a | – | – | – | – | −0.392a | – | – | – | – | −0.417a | |
ΔADC-PGs change in apparent diffusion coefficient of parotid glands, ΔADC-SMGs ΔADC of submandibular glands, ΔuSFR change in salivary flow rate under unstimulated conditions (at rest), ΔsSFR ΔSFR under stimulated condition (citric acid of 2% concentration)
aDenotes a significant correlation between ΔADC and mean radiation dose (P < 0.001)
bDenotes a significant correlation between ΔADC and ΔSFR (P < 0.05)