Risk factors N (%)
Age >45 years 38 (51.4)
Male gender 46 (62.2)
Tumour histology 65 (87.8)
Tumour size >4cm 64 (86.5)
T3b (Tumour of any size, with ETE to strap muscles only) 63 (85.1)
Any central neck node involvement 63 (85.1)
>5 central neck node involvement 37 (50)