| CCT (n = 91) | Without CCT (n = 91) | Standardized differencea | ||
---|---|---|---|---|---|
Number or mean (SD)a | (%)a | Number or mean (SD)a | (%)a | ||
Age (years) | Â | Â | Â | Â | Â |
  ≤ 58 | 47 | (52) | 44 | (48) | 0.066 |
  > 58 | 44 | (48) | 47 | (52) |  |
Gender | Â | Â | Â | Â | Â |
 Female | 5 | (5) | 3 | (3) | 0.107 |
 Male | 86 | (95) | 88 | (97) |  |
Residency | Â | Â | Â | Â | Â |
 Non-north | 66 | (73) | 70 | (77) | 0.101 |
 North | 25 | (27) | 21 | (23) |  |
Comorbidity | Â | Â | Â | Â | Â |
 Without | 79 | (87) | 83 | (91) | 0.141 |
 Withb | 12 | (13) | 8 | (9) |  |
BMI (kg/m2) | Â | Â | Â | Â | Â |
  ≤ 18.5 | 20 | (22) | 14 | (15) | 0.170 |
  > 18.5 | 71 | (78) | 77 | (85) |  |
Drinking | Â | Â | Â | Â | Â |
 No | 13 | (14) | 15 | (16) | 0.061 |
 Yes | 78 | (86) | 76 | (84) |  |
Smoking | Â | Â | Â | Â | Â |
 No | 10 | (11) | 10 | (11) | 0 |
 Yes | 81 | (89) | 81 | (89) |  |
Grade | Â | Â | Â | Â | Â |
 Poorly | 28 | (31) | 23 | (25) | 0.123 |
 Well/moderately differentiated | 63 | (69) | 68 | (75) |  |
Tumor location | Â | Â | Â | Â | Â |
 Upper | 46 | (51) | 44 | (48) |  |
 Middle | 32 | (35) | 35 | (39) | 0.068 |
 Lower | 13 | (14) | 12 | (13) | 0.032 |
Tumor size (cm) | Â | Â | Â | Â | Â |
  ≤ 5 cm | 38 | (42) | 43 | (47) | 0.111 |
  > 5 cm | 53 | (58) | 48 | (53) |  |
Clinical T-stage | Â | Â | Â | Â | Â |
 T1–T2 | 10 | (11) | 9 | (10) | 0.036 |
 T3–T4 | 81 | (89) | 82 | (90) |  |
Clinical N-stage | Â | Â | Â | Â | Â |
 N0 | 9 | (10) | 8 | (9) | 0.038 |
 N1–N2 | 82 | (90) | 83 | (91) |  |
Clinical stage | Â | Â | Â | Â | Â |
 II | 11 | (12) | 10 | (11) | 0.034 |
 III | 80 | (88) | 81 | (89) |  |
Reason for no surgery | Â | Â | Â | Â | Â |
 Without contraindication | 87 | (96) | 87 | (96) | 0 |
 With contraindication | 4 | (4) | 4 | (4) |  |
RT modality | Â | Â | Â | Â | Â |
 3DCRT | 6 | (7) | 3 | (3) | 0.152 |
 IMRT | 85 | (93) | 88 | (97) |  |
Use of PET | Â | Â | Â | Â | Â |
 No | 34 | (37) | 36 | (40) | 0.045 |
 Yes | 57 | (63) | 55 | (60) |  |
RT break | Â | Â | Â | Â | Â |
  ≤ 1 week | 69 | (76) | 70 | (77) | 0.026 |
  > 1 week | 22 | (24) | 21 | (23) |  |
RT dose | Â | Â | Â | Â | Â |
 Low | 23 | (25) | 22 | (24) | 0.025 |
 High | 68 | (75) | 69 | (76) |  |
Induction chemotherapy | Â | Â | Â | Â | Â |
 Without | 87 | (96) | 86 | (95) | 0.051 |
 With | 4 | (4) | 5 | (5) |  |