Table 1.

The 26 treatment subgroups

Subgroup	Stage	Site	Treatment	Patients	Kaplan–Meier survival estimate in % at 24 months	Patients with UW-QOL record	Median (IQR) follow-up in months of UW-QOL record
1	Early	Oral	Surgery only	601	87 (±1)	423	24 (20–29)
2	Early	Pharyngeal	Surgery only	108	88 (±3)	74	22 (18–28)
3	Early	Laryngeal	Surgery only	149	88 (±3)	92	25 (20–31)
4	Early	Other	Surgery only	7	86 (±13)	4	26*
5	Early	Oral	Surgery + RT	119	65 (±4)	69	23 (20–29)
6	Early	Pharyngeal	Surgery + RT	47	93 (±4)	36	23 (18–29)
7	Early	Laryngeal	Surgery + RT	31	87 (±6)	17	26 (21–33)
8	Early	Other	Surgery + RT	7	100 (–)	5	30*
9	Early	Oral	RT or CRT	35	40 (±8)	6	36*
10	Early	Pharyngeal	RT or CRT	38	63 (±8)	15	21 (17–32)
11	Early	Laryngeal	RT or CRT	115	88 (±3)	58	28 (20–43)
12	Early	Other	RT or CRT	11	73 (±13)	6	41*
13	Late	Oral	Surgery only	205	61 (±3)	111	24 (19–28)
14	Late	Pharyngeal	Surgery only	72	73 (±6)	40	21 (17–24)
15	Late	Laryngeal	Surgery only	34	76 (±7)	18	27 (19–45)
16	Late	Other	Surgery only	39	50 (±8)	12	26 (16–53)
17	Late	Oral	Surgery + RT	334	61 (±3)	182	24 (19–28)
18	Late	Pharyngeal	Surgery + RT	197	86 (±3)	145	23 (19–28)
19	Late	Laryngeal	Surgery + RT	68	73 (±5)	27	25 (21–32)
20	Late	Other	Surgery + RT	72	76 (±5)	45	25 (21–31)
21	Late	Oral	RT or CRT	68	21 (±5)	5	25*
22	Late	Pharyngeal	RT or CRT	184	62 (±4)	87	24 (20–29)
23	Late	Laryngeal	RT or CRT	42	46 (±8)	13	21 (14–25)
24	Late	Other	RT or CRT	41	57 (±8)	21	25 (18–30)
Total				2,624	74 (±1)	1,511	24 (20–29)
25			TOLR	132	89 (±3)	93	24 (19–32)
26			Laryngectomy	176	72 (±3)	74	32 (25–59)

UW-QOL = University of Washington Quality of Life; IQR = interquartile range; RT = radiotherapy; CRT = chemoradiotherapy; TORL = transoral laser resection

^*insufficient cases for computing interquartile range