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. Author manuscript; available in PMC: 2022 Jul 1.
Published in final edited form as: Radiother Oncol. 2021 Apr 8;160:32–39. doi: 10.1016/j.radonc.2021.03.036

Table 2.

The numbers and mean XQ scores of patients who filled out the questionnaire at each time point by treatment group.

Number of patients Mean XQ scores SD

Time intervals IMRT IMPT IMRT IMPT D-value IMRT IMPT P value
0–3 months 266 80 39.7 38.0 +1.7 24.8 22.1 0.58
3–6 months 130 41 36.6 36.5 +0.1 23.8 22.8 1.00
6–9 months 130 54 36.5 37.8 −1.3 22.6 20.0 0.72
9–12 months 88 42 30.8 27.9 +2.9 23.0 18.6 0.48
12–18 months 142 47 28.7 24.0 +4.7 22.4 18.6 0.20
18–24 months 138 53 29.0 22.4 +6.6 22.4 16.8 0.051
24–36 months 172 65 27.3 22.7 +4.6 23.5 17.4 0.15

Abbreviations: IMRT, intensity-modulated (photon) radiation therapy; IMPT, intensity-modulated proton therapy; XQ, xerostomia questionnaire; D-value, difference value of mean XQ scores between IMRT and IMPT (IMRT-IMPT); SD, Standard deviation.