Table 3.

Summary statistics of visual acuity in babies with and without retinopathy of prematurity

Statistics of vision in logMAR units	Right eye		Left eye
	ROP present	ROP absent	ROP present	ROP absent
Mean	0.2822	0.2714	0.2925	0.2773
95% CI for mean
Lower bound	0.2758	0.2699	0.2786	0.2709
Upper bound	0.3031	0.2826	0.3063	0.2837
5% trimmed mean	0.2762	0.2714	0.2799	0.2722
Median	0.3000	0.3000	0.3000	0.3000
Variance	0.004	0.003	0.010	0.006
SD	0.06654	0.05245	0.09895	0.07941
Minimum	0.20	0.10	0.20	0.10
Maximum	0.60	0.60	1.00	1.00
Range	0.40	0.50	0.80	0.90
Interquartile range	0.10	0.10	0.10	0.10

SD: Standard deviation, CI: Confidence interval, ROP: Retinopathy of prematurity, logMAR: Logarithm of the minimum angle of resolution