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Table 3 Pre- and postoperative pachymetry values

From: Manual mid-stromal dissection as a low risk procedure to stabilize mild to moderate progressive keratoconus

Case no. Max FU years (m) Central corneal thickness (μm) Δ Pre-op to latest FU (%) Thinnest point thickness (μm) Δ Pre-op to latest FU (%) Remarks
Pre-op 1 yr. FU 2 yr. FU Latest FU Pre-op 1 yr. FU 2 yr. FU Latest FU
1 9.4 (113) 505 502 509 490 −3.0 492 487 496 478 −2.8  
2a 3.1 (37) 513 510 508 509 −0.8 483 487 472 492 + 1.9  
3a 3.0 (36) 534 520 530 524 −1.9 504 487 482 493 −2.2  
4 9.2 (110) 466 469 n.a. 473 + 1.5 451 449 n.a. 444 −1.6  
5 3.9 (47) 414 410 406 404 −2.4 336 321 328 329 − 2.1 Bowman Layer Transplantation (47 m)
6b 8.7 (104) 470 475 473 458 −2.6 446 458 453 441 −1.1  
7 8.8 (106) n.a. (414) (419) (423)   n.a. (407) (408) (429)   
8 7.3 (87) 568 571 564 557 −1.9 511 497 502 506 −1.0  
9 6.8 (82) 470 456 488 476 + 1.3 419 344 395 379 −9.5  
10 8.5 (102) 339 350 325 329 −2.9 313 292 287 274 −12.5  
11 7.3 (87) 497 486 479 486 −2.2 481 465 456 451 −6.2  
12 8.1 (97) 471 481 n.a. 477 + 1.3 466 480 n.a. 471 + 1.1  
13b 7.7 (92) 469 467 469 457 −2.6 434 438 442 440 + 1.4  
14 1.6 (19) 459 385 n.a. 385 −16.1 366 305 n.a. 305 −16.7 Bowman Layer Transplantation (19 m)
15 6.9 (83) 392 376 377 369 −5.9 338 332 325 322 −4.7  
16 5.8 (70) 475 453 458 453 −4.6 465 440 453 445 −4.3  
Average 6.6 (79.5) 469 461 466 456   434 419 424 418   
SD 2.4 (29.4) 56 59 67 61   65 76 73 76   
P-value (pre-op to FU)   0.121 0.126     0.035 0.010    
  1. FU = follow-up; Pre-op = preoperative; m = months; yr. = year; μm = micrometer; n.a. = not available; SD = standard deviation
  2. a,bNote that two patients (cases no. 2, 3, 6, and 13) underwent bilateral manual crosslinking
  3. Case no. 7 was excluded from pachymetry analysis due to a preoperative measurement of insufficient quality