In each model, 13 possible predictors among baseline variables were included in a forced-entry analysis: treatment group assignment, age, height, weight, sex, duration of symptoms, self-rating of physical activity level, days per week of aerobic activity, bilaterality of symptoms, use of medications, severity of radiographic findings, and initial scores for the WOMAC and the 6-minute walk test.

4-6) Acinic cell carcinomas of the parotid gland occur bilaterally in 3% of cases, a rate of bilaterality that is second only to that of Warthin's tumor.

91) Making reference to the conclusion of the new "equal" treaties between the GMD government and foreign countries, Mao Zedong in 1945 contended that bilaterality and mutuality do not guarantee true equality: