Table 2.
Patient characteristics of the study population in the sensitivity analysis
| IGRT (n = 295) | non‐IGRT (n = 295) | |||||
|---|---|---|---|---|---|---|
| Number or mean (sd)† | (%)† | Number or mean (sd)† | (%)† | SDif† | ||
| Age | < 65 | 219 | (74) | 223 | (76) | 0.031 |
| ≥ 65 | 76 | (26) | 72 | (24) | ||
| Gender | Female | 13 | (4) | 9 | (3) | 0.072 |
| Male | 282 | (96) | 286 | (97) | ||
| Residency | Non‐north | 212 | (72) | 209 | (71) | 0.022 |
| North | 83 | (28) | 86 | (29) | ||
| Comorbidity | Without | 178 | (60) | 178 | (60) | 0 |
| With‡ | 117 | (40) | 117 | (40) | ||
| T‐stage | T1‐T2 | 49 | (17) | 47 | (16) | 0.018 |
| T3‐T4 | 246 | (83) | 248 | (84) | ||
| N‐stage | Negative | 19 | (6) | 16 | (5) | 0.043 |
| Positive | 276 | (94) | 279 | (95) | ||
| RT delivery | 3DCRT | § | § | § | § | 0 |
| IMRT | § | § | § | § | ||
| Use of PET | No | 69 | (23) | 63 | (21) | 0.049 |
| Yes | 226 | (77) | 232 | (79) | ||
| Drinking | No | 41 | (14) | 37 | (13) | 0.040 |
| Yes | 254 | (86) | 258 | (87) | ||
| Betel nut chewing | No | 149 | (51) | 147 | (50) | 0.014 |
| Yes | 146 | (49) | 148 | (50) | ||
| Smoking | No | 43 | (15) | 41 | (14) | 0.019 |
| Yes | 252 | (85) | 254 | (86) | ||
| BMI | 22.00 (3.37) | 21.97 (3.69) | 0.007 | |||
| Peri‐CCRT systemic therapy | Without | 206 | (70) | 207 | (70) | 0.007 |
| With | 89 | (30) | 88 | (30) | ||
| RT break | ≤1 week | 205 | (69) | 209 | (71) | 0.030 |
| >1 week | 90 | (31) | 86 | (29) | ||
| RT dose (Gy) | 57.75 (6.67) | 57.91 (6.54) | 0.024 |
†
Rounded.
‡
Carlson comorbidity score ≥ 1.
§
The exact numbers were not reported because of a Health and Welfare Data Science Center (HWDC) database center policy to avoid numbers in single cells (≤2).
3DCRT, 3D conformal radiotherapy; BMI, body mass index; CCRT, concurrent chemoradiotherapy; IGRT, image‐guided radiotherapy; IMRT, intensity‐modulated radiotherapy; PET, positron emission tomography; RT, radiotherapy; sd, standard deviation; SDif, standardized difference.