Table 3. Cost-effectiveness comparison between natural and negative drain after hemithyroidectomy

	No drain (N=118)	Negative drain (N=102)	p-value
Operation times (min)	84.58±19.04	106.81±33.58	<0.001*
Amount of drain (cc)		92.54±46.68
Hospital days (days)	5.34±1.08	6.58±1.53	<0.001*

p<0.001.