Table 6.
Prevalence of astigmatism (right eye cylinder power ≥1.50 diopters), overall and by subtypes of astigmatism, stratified by age, in African American and Hispanic children in the Multi-Ethnic Pediatric Eye Disease Study.
| Age group in months |
N | Prevalence of astigmatism ≥1.50 D n (%)* |
Prevalence of subtypes of astigmatism ≥1.50 D n (%)* |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|
| WTR | ATR | OBL | ||||||||
| AA | Hisp | AA | Hisp | AA | Hisp | AA | Hisp | AA | Hisp | |
| 6 to 11 | 277 | 295 | 50 (18.1) | 98 (33.2) | 28 (10.1) | 81 (27.5) | 9 (3.3) | 0 (0.0) | 13 (4.7) | 17 (5.8) |
| 12 to 23 | 549 | 543 | 53 (9.7) | 73 (13.4) | 23 (4.2) | 60 (11.1) | 16 (2.9) | 4 (0.7) | 14 (2.7) | 9 (1.7) |
| 24 to 35 | 544 | 571 | 49 (9.0) | 61 (10.7) | 35 (6.4) | 46 (8.1) | 10 (1.8) | 3 (0.5) | 4 (0.7) | 12(2.1) |
| 36 to 47 | 532 | 531 | 27 (5.1) | 57 (10.7) | 19 (3.6) | 50 (9.4) | 5 (0.9) | 0 (0.0) | 3 (0.6) | 7 (1.3) |
| 48 to 59 | 548 | 543 | 44 (8.0) | 63 (11.6) | 33 (6.0) | 59 (10.9) | 3 (0.6) | 0 (0.0) | 8 (1.5) | 4 (0.7) |
| 60 to 72 | 543 | 544 | 47 (8.7) | 56 (10.3) | 40 (7.4) | 50 (9.2) | 1 (0.2) | 1 (0.2) | 6 (1.1) | 5 (0.9) |
| Total | 2993 | 3027 | 270 (9.0) | 408(13.5) | 178 (6.0) | 346(11.4) | 44 (1.5) | 8 (0.3) | 48 (1.6) | 54 (1.8) |
AA: African American; Hisp: Hispanic; D: diopters
Percentage of total in corresponding age and ethnic group
WTR: With-the-rule astigmatism, defined as astigmatism with the axis of greatest power within +/− 15 degrees of 90, i.e., in the range [75–105°]; ATR: Against-the-rule astigmatism, defined as astigmatism with the axis of greatest power within +/− 15 degrees of 180, i.e., in the range [1–15°] or [165–180°]; OBL: Oblique axis astigmatism, which includes all other orientations (axis of greatest power in the range [106–164°] or [16–74°]).