Table 4.

The multivariate analysis of the postoperative complications after the lower third molar extraction.

Variables	OR	95% CI	P value
Age (≧32/>32)	1.428	1.040–1.962	<.05
Use of preoperative antibiotic (yes/no)	1.214	0.857–1.720	NS (.276)
Use of preoperative painkiller (yes/no)	1.661	0.668–4.132	NS (.275)
Radiographical association between root and inferior alveolar canal (root structure impinging the superior border of canal/No association between root structure and the superior border of the canal))	1.300	0.908–1.860	NS (=.152)
(Overlapping root structure and canal/no association between root structure and the superior border of the canal)	2.078	1.333–3.238	<.01
(Overlapping root structure and canal/root structure impinging the superior border of canal)	1.599	1.050–2.435	<.05
Pell and Gregory classification (class II/class I)	1.565	1.006–2.435	<.05
(Class III/class I)	1.148	0.637–2.066	NS (.646)
(Class III/class II)	0.733	0.461–1.167	NS (.191)
(Position B/position A)	1.407	0.971–2.041	NS (.072)
(Position C/position A)	3.622	2.079–6.310	<.0001
(Position C/position B)	2.574	1.574–4.210	<.001
Bone removal (yes/no)	1.558	0.657–3.696	NS (.314)
Tooth sectioning (yes/no)	1.171	0.516–2.660	NS (.706)