Table 1.

Demographic data of patients in the observation, edge-approximation and basic fibroblast growth factor application groups

Group	Observation	Edge approximation	FGF	P
No.	16	20	20
Sex, male:female	5 : 11	8 : 12	9 : 11	0.84
Age, years	36.2 ± 11.8	34.6 ± 15.2	36.8 ± 13.7	0.64
Duration, days	4.7 ± 1.2	4.1 ± 1.4	5.1 ± 1.1	0.37
Cause of injury, BI : EB	15 : 1	18 : 2	18 : 1	0.52
Position of perforation, kidney shape: anterior or posterior	6 : 10	10 : 10	11 : 9	0.68
The mean size of the perforation	60.9% ± 4.9%	59.0% ± 4.0%	59.5% ± 4.8%	0.41

Cause of injury: BI, blunt injury was primarily caused by a slap against the ear; EB, explosive blast injury was primarily caused by fireworks or firecrackers.

P < 0.05 was considered to indicate statistical significance.

χ² test.

One-way analysis of variance.