Evaluation of factors affecting the success rate of orthodontic mini-implants by survival analysis

Table 1 Mini-implants’ success and failure rates, and ORs statistics by host variables n (%)

Variables	Success	Failure	Total	P-value	OR (95%CI)
Gender				0.231
Male	96 (84.96)	17 (15.04)	113
Female	252 (89.36)	30 (10.64)	282		0.762 (0.354, 1.274)
Jaw				0.019
Maxilla	199 (91.71)	18 (8.29)	217
Mandible	149 (83.71)	29 (16.29)	178		2.152 (1.151, 4.021)
R/L side				0.877
Left	117 (88.50)	23 (11.50)	200
Right	171 (87.69)	24 (12.31)	195		1.080 (0.587, 1.986)
Age				0.973
< 20	106 (87.60)	15 (12.40)	121
20-30	204 (88.31)	27 (11.69)	231		0.935 (0.477, 1.834)
> 30	38 (88.37)	5 (11.63)	43		0.930 (0.316, 2.732)
Gingival tissue				< 0.001
AG	165 (94.29)	10 (5.71)	175			0.367 (0.163, 3.204)
MGJ	109 (85.83)	18 (14.17)	127		2.724 (1.212, 6.124)
MM	73 (79.35)	19 (20.65)	92		4.294 (1.903, 9.689)	1.576 (0.775, 3.204)

Fisher’s exact test. R/L: Right/left; AG: Attached gingiva; MGJ: Mucogingival junction; MM: Mucous membrane.