Table 3: Multiple regression analysis of the risk factors of functional lesions.

FactorCoefficientOR95% CI value

Age, year0.0201.0200.959–1.0850.528
Location0.4251.5300.761–3.0760.233
Type of enlargement
 Nodular to smooth1.9517.0361.727–28.6670.006

OR: odds ratio; CI: confidence interval.