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Table 1: Tumor site and initial stage (patient level)
Site/Stage % (No.)
Primary site 
    Oropharynx 43.2% (124)
    Larynx 22.3% (64)
    Oral cavity 25.4% (73)
    Hypopharynx 4.2% (12)
    Skin 2.1% (6)
    Unknown 2.8% (8)
Primary stage 
    Tx 7.7% (22)
    Tis 0.3% (1)
    T1 16.4% (47)
    T2 25.4% (73)
    T3 12.2% (35)
    T4a 32.8% (94)
    T4b 4.2% (12)
    T4 0.8% (3)
Nodal stage 
    Nx 4.5% (13)
    N0 28.9% (83)
    N1 11.8% (34)
    N2a 3.1% (9)
    N2b 33.8% (97)
    N2c 16.4% (47)
    N3 1.4% (4)
Distant stage 
    M0 97.9% (281)
    M1 2.1% (6)

Site/Stage	% (No.)
Primary site
Oropharynx	43.2% (124)
Larynx	22.3% (64)
Oral cavity	25.4% (73)
Hypopharynx	4.2% (12)
Skin	2.1% (6)
Unknown	2.8% (8)
Primary stage
Tx	7.7% (22)
Tis	0.3% (1)
T1	16.4% (47)
T2	25.4% (73)
T3	12.2% (35)
T4a	32.8% (94)
T4b	4.2% (12)
T4	0.8% (3)
Nodal stage
Nx	4.5% (13)
N0	28.9% (83)
N1	11.8% (34)
N2a	3.1% (9)
N2b	33.8% (97)
N2c	16.4% (47)
N3	1.4% (4)
Distant stage
M0	97.9% (281)
M1	2.1% (6)