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Table 1 Baseline characteristics by BMI level of patients with metastatic nasopharyngeal carcinoma (NPC)
| Variable | All | Underweight | Normal weight | Overweight/obese | P value* |
|---|---|---|---|---|---|
| Total | 819 | 168 | 431 | 220 | |
| Age (years) | 0.043 | ||||
| <45 | 419 (51.2) | 97 (57.7) | 223 (51.7) | 99 (45.0) | |
| ≥45 | 400 (48.8) | 71 (42.3) | 208 (48.3) | 121 (55.0) | |
| Sex | 0.688 | ||||
| Men | 681 (83.2) | 139 (82.7) | 355 (82.4) | 187 (85.0) | |
| Women | 138 (16.8) | 29 (17.3) | 76 (17.6) | 33 (15.0) | |
| UICC T category | 0.504 | ||||
| T1–2 | 369 (45.1) | 76 (45.2) | 201 (46.6) | 92 (41.8) | |
| T3–4 | 450 (54.9) | 92 (54.8) | 230 (53.4) | 128 (58.2) | |
| UICC N category | 0.221 | ||||
| N0–1 | 417 (50.9) | 89 (53.0) | 227 (52.7) | 101 (45.9) | |
| N2–3 | 402 (49.1) | 79 (47.0) | 204 (47.3) | 119 (54.1) | |
| Metastasis onset | <0.001 | ||||
| Synchronous | 272 (33.2) | 42 (25.0) | 135 (31.3) | 95 (43.2) | |
| Metachronous | 547 (66.8) | 126 (75.0) | 296 (68.7) | 125 (56.8) | |
| Lung metastasis | 0.709 | ||||
| Absent | 469 (57.3) | 96 (57.1) | 242 (56.1) | 131 (59.5) | |
| Present | 350 (42.7) | 72 (42.9) | 189 (43.9) | 89 (40.5) | |
| Liver metastasis | 0.201 | ||||
| Absent | 574 (70.1) | 118 (70.2) | 292 (67.7) | 164 (74.5) | |
| Present | 245 (29.9) | 50 (29.8) | 139 (32.3) | 56 (25.5) | |
| Bone metastasis | 0.032 | ||||
| Absent | 382 (46.6) | 67 (39.9) | 219 (50.8) | 96 (43.6) | |
| Present | 437 (53.4) | 101 (60.1) | 212 (49.2) | 124 (56.4) | |
| Solitary lesion | 0.010 | ||||
| No | 701 (85.6) | 155 (92.3) | 356 (82.6) | 190 (86.4) | |
| Yes | 118 (14.4) | 13 (7.7) | 75 (17.4) | 30 (13.6) | |
| Number of involved sites | 0.592 | ||||
| One | 545 (66.5) | 107 (63.7) | 287 (66.6) | 151 (68.6) | |
| Two or more | 274 (33.5) | 61 (36.3) | 144 (33.4) | 69 (31.4) | |
| Treatment modality | 0.322 | ||||
| CT | 607 (74.1) | 132 (78.6) | 313 (72.6) | 162 (73.6) | |
| CT + LT | 212 (25.9) | 36 (21.4) | 118 (27.4) | 58 (26.4) | |
