Table 4.
Summary statistics for variables measured at the eligibility examination, by enrollment status
| Characteristic | Participants (n=221) | Non-Participants (n=10) |
|---|---|---|
| Mean (std) Age (years) | 11.8 (2.3) | 12.8 (2.5) |
| Mean (std) CISS score | 29.9 (8.9) | 25.9 (6.8) |
| Mean (std) Near Point of Convergence (cm) | 14.3 (7.6) | 11.0 (4.9) |
| Mean (std) Positive Fusional Vergence Break (Δ) | 12.6 (4.7) | 12.0 (1.7) |
| Mean (std) Negative Fusional Vergence Break (Δ) | 14.2 (5.2) | 15.3 (4.4) |
| Mean (std) Monocular Accommodative Amplitude (cm) | 11.6 (4.2) | 10.0 (3.1) |
| % with Accommodative Insufficiency* | 55% | 50% |
| Mean (std) Monocular Accommodative Facility (cpm) | 6.9 (5.2) | 8.3 (3.9) |
| Mean (std) Near Phoria (Δ) | 9.3 exo (4.4) | 9.3 exo (4.2) |
| Mean (std) Distance Phoria (Δ) | 1.9 exo (2.8) | 2.1 exo (2.3) |
| Mean (std) Spherical Equivalent - Right Eye (D) | −0.09 (1.46) | −0.38 (1.38) |
| Gender: % Female | 60% | 40% |
| Race | ||
| % American Indian / Alaskan Native | 5% | 0% |
| % Asian / Pacific Islander | 2% | 20% |
| % Black or African American | 29% | 40% |
| % White | 53% | 40% |
| % Other | 11% | 0% |
| Ethnicity | ||
| % Hispanic or Latino | 34% | 30% |
| % Not Hispanic or Latino | 64% | 70% |
| % Missing | 2% | 0% |
| Attention Deficit Attention Disorder | ||
| % Yes | 15% | 0% |
| % No | 80% | 70% |
| % Missing | 5% | 30% |
*
Defined as participant’s accommodative amplitude less than Hoffstetter’s minimum (15–1/4 age) accommodative amplitude criteria minus 2.0 D
Δ
= prism diopters
cpm = cycles per minute
cm = centimeters
D = Diopters
Std = standard deviation