Table 12.

Descriptive characteristics concerning complete or incomplete data (with complete data indicating that 4 measurements provided an image suitable for analysis); data collected during the follow-up. BCVA: best-corrected visual acuity; DM: cone density (1/mm${}^2$); SM: cone spacing ($\mathsf{\mu }$m); REG: cone regularity (%); CD: cone dystrophy; CRD: cone–rod dystrophy; STGD: Stargardt disease. The bold was used in all p-Values lower than 0.05 (=with statistical significance).

		Incomplete Data ($\mathit{N}=19$)	Complete Data ($\mathit{N}=37$)	p-Value (Test)
Mean age (SD)		$39.63\left(14.3\right)$	$35.39\left(13.95\right)$	$0.360$
				(t-test)
Sex
	Male	$47.4\%(N=9)$	$40.5\%(N=15)$	$0.839$
	Female	$52.6\%(N=10)$	$59.5\%(N=26)$	(chi-squared)
Diagnosis
	CD	$21.1\%(N=4)$	$16.2\%(N=6)$	$0.838$
	CRD	$10.5\%(N=2)$	$16.2\%(N=6)$	(Fisher)
	STGD	$68.4\%(N=13)$	$67.6\%(N=25)$
BCVA
	Mean (SD)	0.1 (0.12)	0.14 (0.18)	0.416
	Median (IQR)	0.05 (0.04–0.11)	0.06 (0.05–0.2)	(Mann–Whitney U)
	Range	0.01–0.4	0.01–0.8
DM
	Mean (SD)	8071.89 (2892.07)	10,884.85 (3011.82)	0.004
	Median (IQR)	7943.67 (5992–8886.5)	10.738 (9092.75–12,774.5)	(t-test)
	Range	4584.33–15,067	3830–16,341.25
SM
	Mean (SD)	13.17 (3.17)	11.75 (4.52)	0.013
	Median (IQR)	12.24 (11.36–13.91)	10.5 (9.8–11.76)	(Mann–Whitney U)
	Range	9.04–21.18	8.59–35.08
REG
	Mean (SD)	83.96 (7.48)	84.53 (6.83)	0.357
	Median (IQR)	84.76 (81.12–86.41)	86.17 (82.81–88.97)	(Mann–Whitney U)
	Range	66.67–96.77	60.66–92.46