Table 3.

The results of binary logistic regression model predicting whether the patient had experienced at least a minimum clinically important improvement in the 15D score from baseline to 6 months after operation.

Variable	Regression coefficient	Significance
Constant	9.506	0.112
Age (years)	−0.037	0.217
Gender (0=female, 1=male)	−0.480	0.481
Educational levela	1.858	0.003
Preoperative serum calcium	−2.112	0.555
Preoperative serum PTH	0.001	0.817
Preoperative serum 25OHD	0.028	0.156
No. of regular medication	0.084	0.410
Preoperative 15D score	−6.180	0.057
Presence of self-reported symptoms	−0.959	0.100

^aHigh school or more=1, less than high school=0.