BMC Ophthalmology

Table 2 Retinal boundary detection error scores 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
RBDEs	Suboptimal setting	Optimal setting	p	Suboptimal setting	Optimal setting	p
Entire scan	*9.1 ±6.5*	*6.8 ±6.3*	*0.007*	*4.4 ±2.6*	*2.5 ±1.6*	*0.036*
Entire scan	*8 [4, 11]*	*5 [2, 11]*	*0.007*	*4 [3, 6]*	*2 [1, 4]*	*0.036*
Center	4.8 ±5.2	4.1 ±4.7	0.225	1.2 ±1.7	0.7 ±1.1	0.285
Center	4 [1,7]	3 [0, 7]	0.225	1 [0, 2]	0 [0, 1]	0.285
Periphery	*4.2 ±2.8*	*2.7 ±2.6*	*0.001*	3.2 ±2.4	1.8 ±1.3	0.093
Periphery	*4 [3, 5]*	*2 [1, 4]*	*0.001*	4 [2, 4]	2 [1, 3]	0.093
	DME group			AMD group
RBDEs	Suboptimal setting	Optimal setting	p	Suboptimal setting	Optimal setting	p
Entire scan	*9.7 ±3.3*	*5.1 ±3.7*	*0.008*	13.1 ±8.7	12.9 ±6.8	0.919
Entire scan	*10 [8, 11]*	*5 [3, 8]*	*0.008*	14 [5, 18]	14 [10, 17]	0.919
Center	5.6 ±3.6	3.7 ±2.8	0.097	7.7 ±6.8	7.9 ±5.7	0.833
Center	6 [4, 7]	4 [2, 5]	0.097	6 [2, 14]	9 [3, 13]	0.833
Periphery	*4.1 ±2.2*	*1.4 ±1.7*	*0.008*	5.4 ±3.5	5.0 ±2.8	0.441
Periphery	*4 [3, 5]*	*1 [0, 3]*	*0.008*	5 [3, 9]	6 [2, 7]	0.441

The results for the pitfalls are shown as means ± SD and median [interquartile range]. Bold and italic font is used for the indication of significant differences between groups. Retinal boundary detection error (RBDE) scores and regional retinal thickness values between the suboptimal and optimal scan distance settings were compared using Wilcoxon test.
Abbreviations: RBDEs retinal boundary detection error scores, DME diabetic macular edema, AMD age-related macular degeneration, SSI signal strength index, SD standard deviation.

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