Table 2.

Summary statistics for clinical and demographic measures from the enrollment visit, by study.

	Subjects with NBV		Symptomatic
Characteristic	Masked (N=46)	Unmasked (n=56)	CI subjects (N=221)
Mean (SD) age in years	12.5 (2.4)	11.4 (2.2)	11.8 (2.3)
% Girls	60.9	45.5	59.3
Race
% American Indian/Alaskan Native	0.0	0.0	4.6
% Asian/Pacific Islander	2.2	4.3	1.8
% Black or African American	45.7	42.6	29.7
% White	32.6	51.1	54.8
% Other	19.6	2.1	9.1
% Hispanic or Latino	13.0	14.6	34.4
% self-reported ADHD	0.0	0.0	15.4
% visual acuity 20/20 equivalent or better at near	89.1	100.0	81.0
Mean (SD) Spherical Equivalent – Right Eye (D)	−0.75 (2.1)	−0.66 (1.6)	−0.08 (1.5)
Refractive error category – Right eye
% Myopic (more than −0.50D SPHEQ)	30.4	38.9	22.6
% Hyperopic (more than +1.00D SPHEQ)	0.0	3.7	9.1
% Emmetropic	69.6	57.4	68.3
% Glasses wearer	37.0	n/a	34.4
Mean (SD) Near Point of Convergence (cm)
Break	3.5 (1.2)	3.7 (1.1)	14.2 (7.5)
Recovery	5.2 (1.7)	5.4 (1.4)	17.9 (8.2)
Mean (SD) Positive Fusional Vergence (Δ)
Blur/Break	24.0 (10.2)	24.8 (8.4)	10.9 (3.9)
Recovery	22.1 (7.7)	20.2 (8.0)	8.8 (4.5)
Mean (SD) Phoria (Δ)
At Near	2.1 exo (2.3)	1.7 exo (2.3)	9.3 exo (4.4)
At Distance	0.6 exo (1.3)	0.6 exo (1.3)	1.9 exo (2.8)
% with Intermittent Tropia
At Near	0.0	0.0	10.4
At Distance	0.0	0.0	2.7
% failed Sheard’s criterion	2.2	0.0	82.3
Mean (SD) Negative Fusional Vergence (Δ)
Blur/Break	12.8 (4.4)	13.8 (6.2)	11.2 (4.7)
Recovery	11.0 (3.6)	11.0 (5.6)	9.9 (4.4)
Mean (SD) Monocular (O.D.) Accommodative Amplitude (D)	16.2 (4.1)	17.8 (6.5)	9.9 (3.8)
% with Accommodative Insufficiency	0.0	5.5	54.8
Mean (SD) Monocular (O.D.) Accommodative Facility (cycles/min)	8.9 (5.8)	11.8 (3.6)	6.5 (4.4)