Table I.
Variable | Total | SPM-Free | SPM | P-values* | |||
---|---|---|---|---|---|---|---|
No. | % | No. | % | No. | % | ||
Total patients | 1384 | 100 | 1274 | 92.1 | 110 | 7.9 | |
Age | |||||||
≤ median (57 years) | 726 | 52.5 | 690 | 54.2 | 36 | 32.7 | < 0.001 |
> median (57 years) | 658 | 47.5 | 584 | 45.8 | 74 | 67.3 | |
Sex | 0.761 | ||||||
Male | 1053 | 76.1 | 968 | 76.0 | 85 | 77.3 | |
Female | 331 | 23.9 | 306 | 24.0 | 25 | 22.7 | |
Ethnicity | 0.100 | ||||||
Non-Hispanic White | 1160 | 83.8 | 1074 | 84.3 | 86 | 78.2 | |
Other | 224 | 16.2 | 200 | 15.7 | 24 | 21.8 | |
Smoking | 0.021 | ||||||
Never | 382 | 27.6 | 362 | 28.4 | 20 | 18.2 | |
Ever | 1002 | 72.4 | 912 | 71.6 | 90 | 81.8 | |
Alcohol | 0.052 | ||||||
Never | 373 | 26.9 | 352 | 27.6 | 21 | 19.1 | |
Ever | 1011 | 73.1 | 922 | 72.4 | 89 | 80.9 | |
Index Cancer Site | 0.114 | ||||||
Oral cavity | 453 | 32.7 | 419 | 33.0 | 34 | 30.9 | |
Oropharynx | 623 | 45.1 | 580 | 45.5 | 43 | 39.1 | |
Larynx/Hypopharynx | 307 | 22.2 | 274 | 21.5 | 33 | 30.0 | |
Index Cancer Stage | 0.819 | ||||||
1 or 2 | 352 | 25.4 | 323 | 25.4 | 29 | 26.4 | |
3 or 4 | 1031 | 74.6 | 950 | 74.6 | 81 | 73.6 | |
Treatment | 0.983 | ||||||
Surgery only | 247 | 17.9 | 228 | 17.9 | 19 | 17.3 | |
Surgery + Adjuvant Tx1 | 343 | 24.8 | 314 | 24.6 | 29 | 26.4 | |
XRT2 | 348 | 25.1 | 321 | 25.2 | 27 | 24.5 | |
XRT + Chemotherapy | 446 | 32.2 | 411 | 32.3 | 35 | 31.8 |
P values were calculated from chi-square test
Adjuvant Tx: adjuvant radiotherapy and/or chemotherapy
XRT: radiotherapy