Table 2.

Electron microscopy class on the basis of the Ehrenreich and Churg classification

Ehrenreich and Churg ClassificationEXT1/EXT2-Negative, n=252 (67.4%)EXT1/EXT2-Positive, n=122 (32.6%)P Valuea
19 (3.6%)8 (6.6%)0.19
272 (28.6%)58 (47.5%)<0.001
3167 (66.3%)56 (45.9%)<0.001
43 (1.2%)0 (0.0%)0.23
  • a P<0.05 is considered significant.