Table 4.

Predictive factors with different groups of complications (All major complications, TORS related major complications and non TORS related major complications). (OR Odds ratio, ASA American association of Anesthesiologists)

Variable		Overall complications > grade 3	Unadjusted OR	p value	Non TORS related complications > grade 3	Unadjusted OR	p value	TORS related complications > grade 3	Unadjusted OR	p value
Age> 60	>60	14/47	3.11 (1.22–7.93)	0.017	2/47	0.79 (0.14–4.49)	0.789	12/47	3.33 (1.20–9.21)	0.021
Age> 60	<60	9/75	Reference	0.017	4/75	Reference	0.789	7/75	Reference	0.021
Tobacco	Y	14/71	1.15 (0.45–2.90)	0.773	4/71	1.46 (0.26–8.31)	0.668	11/71	0.99 (0.37–2.66)	0.977
Tobacco	N	9/51	Reference	0.773	2/51	Reference	0.668	8/51	Reference	0.977
Previous cancer	Y	7/35	1.11 (0.41–2.99)	0.837	1/35	0.48 (0.05–4.28)	0.513	6/35	1.18 (0.41–3.39)	0.762
Previous cancer	N	16/87	Reference	0.837	5/87	Reference	0.513	13/87	Reference	0.762
Any Comorbidity	Y	22/98	6.66 (0.85–52.11)	0.071	5/98	1.24 (0.14–11.10)	0.850	18/98	5.17 (0.66–40.86)	0.119
Any Comorbidity	N	1/24	Reference	0.071	1/24	Reference	0.850	1/24	Reference	0.119
Subsite	Tonsil	10/56	0.81 (0.31–2.10)	0.817	5/56	5.00 (0.56–44.31)	0.340	7/56	0.60 (0.21–1.71)	0.626
	Base of Tongue	11/52	Reference		1/52	Reference		10/52	Reference
	Other	2/14	0.62 (0.12–3.20)		0/14	0.006 (0.00–5×10¹⁸⁾		2/14	0.70 (0.13–3.64)
ASA	1,2	9/34	Reference	0.105	0/34	Reference	0.563	2/33	Reference	0.095
ASA	3,4	14/85	2.90 (0.80–10.50)	0.105	6/85	1.90 (0.21–16.94)	0.563	17/89	3.66 (0.80–16.81)	0.095
Neck Dissection	Y	17/94	0.81 (0.28–2.30)	0.692	6/94	1566 (0.0–3×10²⁷)	0.797	13/94	0.59 (0.20–1.73)	0.334
Neck Dissection	N	6/28	Reference	0.692	0/28	Reference	0.797	6/28	Reference	0.334
Extent of surgery	1	7/44	Reference	0.022	3/44	Reference	0.96	5/44	Reference	0.034
	2	2/34	0.33 (0.06–1.71)		0/34	0 (0–8×10¹⁸)		2/34	0.49 (0.09–2.68)
	>3	14/44	2.47 (0.88–6.89)		3/44	1.00 (0.19–5.25)		12/44	2.93 (0.93–9.18)