Table 1.
Demographic or medical background information in the group of patients exposed to their radiotherapy and in the group of patients unexposed
| Received radiotherapy (n = 51) | Not received radiotherapy (n = 54) | P | |
|---|---|---|---|
| Age, mean ± SD, year | 47.0 ± 5.2 | 46.6 ± 6.2 | 0.755 |
| Handedness: right-handedness, no. (%) | 49 (96.1) | 53 (98.1) | 0.611 |
| Hight, mean ± SD, cm | 156.9 ± 6.5 | 156.0 ± 5.2 | 0.432 |
| Weight, mean ± SD, kg | 56.9 ± 9.0 | 54.9 ± 6.3 | 0.196 |
| BMI, mean ± SD, kg/m2 | 23.1 ± 3.4 | 22.5 ± 2.4 | 0.333 |
| Education, mean ± SD, year | 13.1 ± 1.9 | 13.2 ± 1.8 | 0.797 |
| Smoking, no. (%) | 8 (15.7) | 3 (5.6) | 0.116 |
| Accumulated alcohol consumption, mean ± SD, kg | 38.4 ± 60.4 | 27.9 ± 84.6 | 0.043† |
| Postmenopausal, no. (%) | 29 (56.9) | 31 (57.4) | 1.000 |
| PS: 0, no. (%) | 35 (71.4)1 | 38 (70.4) | 1.000 |
| Clinical stage: 0–I, no. (%) | 25 (49.0) | 13 (24.1) | 0.014† |
| Lymphnode metastasis: positive, no. (%) | 15 (29.4) | 18 (33.3) | 0.824 |
| Histological type, no. (%) | |||
| Carcinoma in situ | 4 (7.8) | 2 (3.7) | 0.428 |
| Invasive carcinoma | 39 (76.5) | 44 (81.5) | 0.696 |
| Special type | 8 (15.7) | 8 (14.8) | 1.000 |
| Histological grade: poor, no. (%) | 14 (27.5) | 14 (25.9) | 1.000 |
| Surgical type: partial mastectomy, no. (%) | 51 (100.0) | 6 (11.1) | 0.000††† |
| Axillary lymphadectomy, no. (%) | 26 (51.0) | 44 (81.5) | 0.002†† |
| Days after surgery, mean ± SD, day | 304 ± 101 | 270 ± 105 | 0.102 |
| Radiotherapy: boost irradiation, no. (%) | 20 (39.2) | NA | NA |
| Days after radiotherapy, mean ± SD, day | 226 ± 100 | NA | NA |
| Chemotherapy, no. (%) | 25 (49.0) | 26 (48.1) | 1.000 |
| Hormonal therapy, no. (%) | 17 (33.3) | 15 (27.8) | 0.685 |
NA, not applicable; BMI, body mass index; PS, performance status.
1
Two missing values were excluded.
†
Significant difference (P < 0.05) between radiotherapy group and no-radiotherapy group.
††
Significant difference (P < 0.01) between radiotherapy group and no-radiotherapy group.
†††
Significant difference (P < 0.001) between radiotherapy group and no-radiotherapy group.