Table 2

Non-parametric Kruskal-Wallis tests and post hoc pairwise comparisons for parafoveal capillary density and per cent area deviated from normal distribution measurements in three study groups

Region of interest	Parafoveal capillary density
	Mean±SD%			Kruskal-Wallis tests	Post hoc pairwise comparisons
	Control	NP-SCR	P-SCR	Kruskal-Wallis tests	Control versus NP-SCR	Control versus P-SCR	NP-SCR versus P-SCR
Entire Image	41.45±1.95	37.19±4.00	36.43±3.46	P<0.001*	P<0.001*	P<0.001*	P=0.980
Temporal	41.53±2.03	36.28±5.58	34.92±5.86	P<0.001*	P<0.001*	P<0.001*	P=1.000
Nasal	41.79±2.13	37.81±3.65	37.65±2.84	P<0.001*	P<0.001*	P<0.001*	P=1.000
Superior	41.38±2.18	36.98±4.43	35.95±3.93	P<0.001*	P<0.001*	P<0.001*	P=1.000
Inferior	41.15±2.16	37.46±4.32	36.97±3.22	P<0.001*	P<0.001*	P<0.001*	P=1.000
	Per cent yellow area
Entire image	4.59±3.75	15.94±14.90	18.00±11.72	P<0.001*	P<0.001*	P<0.001*	P=0.833
Temporal	4.31±4.58	19.94±22.71	24.07±20.18	P<0.001*	P<0.001*	P<0.001*	P=0.689
Nasal	3.75±2.96	13.49±12.40	13.44±10.60	P<0.001*	P<0.001*	P<0.001*	P=1.000
Superior	4.71±4.61	16.56±16.08	20.76±14.37	P<0.001*	P<0.001*	P<0.001*	P=0.614
Inferior	5.59±4.31	14.99±16.13	15.12±11.74	P=0.008*	P=0.023*	P=0.017*	P=1.000
	Per cent red area
Entire image	0.76±0.92	5.96±9.65	6.92±6.62	P<0.001*	P=0.001*	P<0.001*	P=0.346
Temporal	0.60±0.91	9.41±17.39	12.65±15.51	P<0.001*	P=0.002*	P<0.001*	P=0.568
Nasal	0.51±0.95	4.05±5.97	3.91±4.75	P<0.001*	P<0.001*	P<0.001*	P=1.000
Superior	0.86±1.25	6.15±10.69	8.43±9.85	P<0.001*	P=0.004*	P<0.001*	P=0.178
Inferior	0.99±1.27	5.47±12.44	4.44±5.38	P=0.011*	P=0.035*	P=0.017*	P=1.000

*P<0.05.
NP-SCR, non-proliferative sickle cell retinopathy; P-SCR, proliferative sickle cell retinopathy.