From: High-risk factors of parotid lymph node metastasis in nasopharyngeal carcinoma: a case-control study
Variables | Total No. (%) | Cases(22 sides) | Controls(44 sides)a | p value* |
---|---|---|---|---|
RPNb | ||||
Involvement | 53 (80.3) | 20 | 33 | 0.229 |
SLDc | 1.8 (0-5.5) | 2.4(0-5.5) | 1.5(0-4.7) | 0.106 |
ENSd | 43 (65.2) | 17 | 26 | 0.144 |
Necrosis | 20 (30.3) | 6 | 14 | 0.705 |
Level II | ||||
Involvement | 66 (100) | 22 | 44 | - |
SLDc | 4.5 (1.0-14.7) | 6.0(1.5-14.7) | 3.6(1.0-9.0) | 0.003* |
SLD ≥ 5.0 cm | 28 (42.4) | 16 | 12 | <0.001* |
ENSd | 59 (89.4) | 21 | 38 | 0.409 |
Necrosis | 44 (66.7) | 19 | 25 | 0.016* |
Level III | ||||
Involvement | 45 (68.2) | 16 | 29 | 0.575 |
SLDc | 0.9 (0-7.2) | 1.0(0-7.2) | 0.8(0-3.8) | 0.211 |
ENSd | 33 (50.0) | 10 | 23 | 0.602 |
Necrosis | 14 (21.2) | 4 | 10 | 0.915 |
Level IV | ||||
Involvement | 21 (31.8) | 10 | 11 | 0.093 |
SLDc | 0.0 (0-6.9) | 0.0(0-6.9) | 0.0(0-2.0) | 0.179 |
ENSd | 15 (22.7) | 7 | 8 | 0.213 |
Necrosis | 4 (6.1) | 2 | 2 | 0.596 |
Level Va/b | ||||
Involvement | 19 (28.8) | 10 | 9 | 0.034* |
SLDc | 0.0 (0-9.3) | 0.0(0-9.3) | 0.0(0-2.2) | 0.299 |
ENSd | 6 (9.1) | 4 | 2 | 0.167 |
Necrosis | 4 (6.1) | 3 | 1 | 0.104 |
Rare-neck area involvemente | ||||
18 (27.3) | 12 | 6 | <0.001* | |
No. of involved levelsf | ||||
Median | 2 .0(1-5) | 3.5(1-5) | 2.0(1-5) | 0.045* |
≥ 4 levels | 17 (25.8) | 11 | 6 | 0.001* |