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Table 5 The regional retinal thickness values obtained with suboptimal and optimal scan distance settings

From: The effect of incorrect scanning distance on boundary detection errors and macular thickness measurements by spectral domain optical coherence tomography: a cross sectional study

 

“All-eyes” group

Normal group

ETDRS regions

Suboptimal setting (μm)

Optimal setting (μm)

p

Suboptimal setting (μm)

Optimal setting (μm)

p

R1

295.7 ±137.7

301.0 ±139.5

0.100

242.5 ±17.8

242.1 ±17.1

0.208

R2

340.7 ±78.9

342.2 ±85.8

0.072

327.3 ±10.4

326.8 ±12.4

1.000

R3

338.9 ±95.9

348.6 ±103.3

0.106

323.3 ±17.9

320.7 ±13.8

0.063

R4

335.4 ±78.8

349.3 ±95.4

0.178

323.1 ±15.7

327.2 ±13.8

0.944

R5

338.1 ±98.6

348.7 ±102.4

0.734

309.8 ±12.0

316.1 ±13.6

0.919

R6

303.9 ±54.9

303.6 ±55.5

0.023

289.9 ±9.6

285.7 ±15.3

0.735

R7

319.7 ±64.3

304.3 ±59.4

0.627

306.1 ±10.7

285.0 ±8.8

0.445

R8

293.6 ±49.7

293.3 ±54.4

0.280

282.5 ±11.1

279.6 ±12.0

0.183

R9

305.1 ±61.8

313.0 ±65.8

0.290

284.5 ±9.8

282.8 ±10.0

0.066

 

DME group

AMD group

ETDRS regions

Suboptimal setting (μm)

Optimal setting (μm)

p

Suboptimal setting (μm)

Optimal setting (μm)

p

R1

400.9 ±196.5

419.6 ±195.0

0.541

243.7 ±36.8

247.3 ±37.3

0.173

R2

398.5 ±108.7

405.8 ±122.7

0.042

296.4 ±35.7

298.8 ±34.8

0.477

R3

404.1 ±137.3

431.8 ±144.7

0.477

289.4 ±38.5

299.0 ±38.4

0.646

R4

397.2 ±104.0

428.1 ±131.2

0.646

285.8 ±32.8

298.2 ±34.5

0.097

R5

415.2 ±137.6

438.9 ±139.7

0.083

289.3 ±30.6

296.8 ±25.8

0.359

R6

347.6 ±73.7

343.3 ±77.2

0.008

274.3 ±23.4

284.1 ±31.1

0.314

R7

369.8 ±87.2

363.0 ±72.2

0.260

283.3 ±26.0

268.9 ±20.5

0.445

R8

336.4 ±59.2

341.3 ±70.6

0.919

261.9 ±28.9

262.3 ±21.7

0.477

R9

362.0 ±75.6

373.8 ±85.6

0.154

268.7 ±25.9

285.6 ±23.4

0.086

  1. The thickness values are shown as means ± SD. Regional retinal thickness values between the suboptimal and optimal scan distance settings were compared using Wilcoxon test. Bold and italic font is used for the indication of significant differences between groups.
  2. Abbreviations: DME diabetic macular edema, AMD age-related macular degeneration, ETDRS Early Treatment Diabetic Retinopathy Study.