Table 3 Stratified analysis on the relationships between central lymph node metastasis and age, tumor diameter of PTC patients
Variable | Overall PTC(n = 943) | PTC > 10 mm(n = 373) | PTMC(n = 570) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Yes | No | P | Yes | No | P | Yes | No | P | |||||||
n | (%) | n | (%) | n | (%) | n | (%) | n | (%) | n | (%) | ||||
Age (years) | |||||||||||||||
 ≤30 | 80 | (84) | 15 | (16) | <0.001 | 51 | (100) | 0 | (0) | < 0.001 | 29 | (66) | 15 | (34) | 0.001 |
 30~ | 100 | (56) | 79 | (44) | 53 | (79) | 14 | (21) | 47 | (42) | 65 | (58) | |||
 40~ | 163 | (49) | 172 | (51) | 82 | (66) | 42 | (34) | 81 | (38) | 130 | (61) | |||
 50~ | 118 | (49) | 122 | (51) | 64 | (70) | 27 | (30) | 54 | (36) | 95 | (64) | |||
 50~ | 44 | (47) | 50 | (53) | 25 | (63) | 15 | (37) | 19 | (35) | 35 | (65) | |||
Tumor diameter (mm) | |||||||||||||||
 ≤ 5 | 78 | (31) | 170 | (69) | < 0.001 | – | – | – | – |  | 78 | (31) | 170 | (69) | <0.001 |
 5~ | 152 | (47) | 170 | (53) | – | – | – | – |  | 152 | (47) | 170 | (53) | ||
 10~ | 118 | (67) | 58 | (33) | 118 | (67) | 58 | (33) | 0.02 | -- | -- | -- | -- |  | |
 15~ | 70 | (76) | 22 | (24) | 70 | (76) | 22 | (24) | -- | -- | -- | -- |  | ||
 > 20 | 87 | (83) | 18 | (17) | 87 | (83) | 18 | (17) | -- | -- | -- | -- |  | ||