Table 3.

Associations of clinical factors with postoperative bleeding

Factors	Postoperative bleeding		p value
	No	Yes
Hypertension
No	129	6	0.7a
Yes	48	3
Abnormal coagulability
No	171	7	0.05a
Yes	6	2
Intraoperative use of drills
No	148	7	0.64a
Yes	29	2
Postoperative antimicrobial administration
No	41	5	0.04a
Yes	136	4
Intraoperative blood loss (ml)	71.6 ± 112.1	49.4 ± 66.7	0.53b

^aFisher’s exact test

^bMann–Whitney U test