Comprehension of near and distance stereoacuity tests at recruitment by age category
| Age at recruitment (years) | N | Comprehended near Frisby at recruitment | Comprehended FD2 at recruitment | ||
| n/n | % | n/n | % | ||
| <3 | 142 | 62/142 | 44 | 5/105* | 5 |
| Negative (absent) | 3/62 | 5 | 4/5 | 80 | |
| 3 | 106 | 78/105† | 75 | 24/77‡ | 31 |
| Negative (absent) | 2/78 | 3 | 11/24 | 46 | |
| 4 | 76 | 67/74§ | 90 | 41/63¶ | 65 |
| Negative (absent) | 1/67 | 1.5 | 11/41 | 27 | |
| >5 | 136 | 131/133** | 99 | 86/96†† | 90 |
| Negative (absent) | 2/131 | 1.5 | 22/86 | 26 | |
*Test not available in 37 cases.
†Poor concentration in one case; missing in one case.
‡Poor concentration in two cases; missing in one case; test not available in 26 cases.
§“Other test used” in one case; poor concentration in one case.
¶ Poor concentration in two cases; missing in one case; not available in 10 cases.
**“Other test used” in three cases.
††Poor concentration in three cases; not available in 37 cases.
*Test not available in 37 cases.
†Poor concentration in one case; missing in one case.
‡Poor concentration in two cases; missing in one case; test not available in 26 cases.
§“Other test used” in one case; poor concentration in one case.
¶ Poor concentration in two cases; missing in one case; not available in 10 cases.
**“Other test used” in three cases.
††Poor concentration in three cases; not available in 37 cases.