Table 1.

Clinical characteristics of both groups

	Case n = 8 (%)	Control n = 14 (%)
Age (years), mean	61.25 ± 8.44	57.86 ± 6.03
Sex: Male	8 (100.0)	10 (90.9)
Female	0 (0)	1 (9.1)
Body mass index	22.84 ± 3.52	24.57 ± 4.73
Postoperative radiotherapy	0 (0)	1 (9.1)
T status: T1	4 (50.0)	10 (71.4)
T2	4 (50.0)	2 (14.3)
T3	0 (0)	2 (14.3)
N status: N0	8 (100.0)	14 (100.0)
M status: M0	8 (100.0)	14 (100.0)
Defect size: More than or equal to 7 × 7 cm	1 (12.5)	3 (21.4)
6 × 6 cm to 7 × 7 cm	5 (62.5)	7 (50.0)
Smaller than 6 × 6 cm	2 (25.0)	4 (28.6)
Alcohol consumption: Yes	4 (50.0)	10 (71.4)
No	4 (50.0)	4 (28.6)
Smoking: Yes	8 (100.0)	12 (85.7)
No	0 (0)	2 (14.3)
Betel nut chewing: Yes	8 (100.0)	14 (100.0)
No	0 (0)	0 (0)