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Table 6 Linear Regression Analysis of Visual Outcomes

From: Malapposition of graft-host interface after penetrating keratoplasty (PK) and deep anterior lamellar keratoplasty (DALK): an optical coherence tomography study

Dependent variable (Y)

Independent variable (X)

Coefficient of regression β (P)

Constant α (P)

Linear regression equation

95% confidence interval (CI) of β

SE (diopter)

F (step)

6.851 (.001)

−5.850 (<.0001)

Y = 6.851X-5.850

2.975–10.727

F (graft step)

5.428 (0.005)

−4.708 (<.0001)

Y = 5.428X-4.708

1.685–9.171

GHT

−0.019 (0.021)

10.391 (0.069)

Y = -0.019X + 10.391

−0.036 - -0.003

Pm

5.164 (0.018)

−5.912 (<.0001)

Y = 5.164X-5.912

0.913–9.416

Sm

0.018 (0.037)

−5.046 (<.0001)

Y = 0.018X-5.046

0.001–0.035

Tg

0.019 (0.022)

−15.588 (0.006)

Y = 0.019X-15.588

0.003–0.035

|Tg-Th|

0.031 (0.007)

−5.501 (<.0001)

Y = 0.031X-5.501

0.009–0.054

logMAR BCVA

F (protrusion)

 

GHT

0.001 (0.030)

−0.312 (0.309)

Y = 0.001X-0.312

0–0.002

Tg

0.001 (0.001)

−0.615 (0.028)

Y = 0.001X-0.615

0.001–0.002

DS (diopter)

F (step)

6.319 (0.001)

−3.459 (0.001)

Y = 6.319X-3.459

2.698–9.940

F (graft step)

5.067 (0.005)

−2.427 (0.005)

Y = 5.067X-2.427

1.582–8.522

GHT

−0.02 (0.010)

12.948 (0.015)

Y = -0.02X + 12.948

−0.035 - -0.005

Pm

4.518 (0.027)

−3.374 (0.013)

Y = 4.518X-3.374

0.526–8.511

Tg

0.017 (0.025)

−12.336 (0.018)

Y = 0.017X-12.336

0.002–0.033

|Tg-Th|

0.027 (0.015)

−2.564 (0.009)

Y = 0.027X-2.564

0.006–0.048

Astig value (diopter)

Sm

0.017 (0.047)

−1.598 (0.176)

Y = 0.017X-1.598

0–0.033

  1. CI Confidence interval, SE Spherical equivalent diopter, DS Diopter of spherical power, GHT Graft-host touch, logMAR BCVA Logarithm of minimum angle of resolution best-corrected visual acuity, Tg Junctional graft thickness, F (step) Frequency of step, F (graft step) Frequency of graft step, Pm Total prevalence of malapposition proportion, Sm Size of malapposition, |Tg-Th| Disparity between junctional graft and host thickness, Sm Size of malapposition