Table 1.

Summary statistics of the patients.

Factor		Study group	Control group	χ2	p-value
Sex	Male	41	48	0.992	0.319
	Female	59	52
Age	>75 years	38	48	2.04	0.153
	≤75 years	62	52
BMI	≤24	47	48	0.020	0.887
	>24	53	52
Oral hygiene	Periodontitis	50	55	2.976	0.084
	Non-periodontitis	50	45
Anesthesia	Block	29	23	0.936	0.333
	Infiltration	71	77
Pre-operative antibiotics use	Yes	23	15	1.125	0.289
	No	77	85
Number	<4	88	82	1.412	0.235
	≥4	12	18
Granulation	Yes	37	45	1.323	0.250
	No	63	55
Surgical extraction	Yes	20	30	2.667	0.102
	No	80	70
Duration of surgery	≤10 min	77	84	1.561	0.212
	>10 min	23	16
Smoking history	Yes	5	8	0.740	0.390
	No	95	92
Systematic diseases	Requiring antithrombotic therapy	98/2	0/100	192.157	<0.01∗
	Hypertension	55/45	47/53	1.281	0.258
	Diabetes	22/78	26/74	0.439	0.508

BMI: body mass index; ∗Fisher's exact test, p < 0.05.