Table 2.

Primary analysis: Incidence probability of oral mucositis

Oral mucositis grade 1 or worse (by oncologist)	POC group (n = 82), n (%)	C group (n = 87), n (%)	p valuea
Overall			.034
Yes	62 (75.6)	78 (89.7)
No	20 (24.4)	9 (10.3)
Risk difference, % (95% CI)a	−11.88 (−22.82 to −0.95)

^aWeighted analysis by inverse probability of censoring nonparametrically estimated by Kaplan‐Meier method; the weight was also estimated nonparametrically stratified by the treatment assignment and the three factors used for minimization: use of bone‐modifying agents (yes or no), age (<65 or ≥65 years), and use of chemotherapy within 3 months (yes or no).

Abbreviations: C, control; CI, confidence interval; POC, professional oral care.