Table 2.
Percentage of strabismus by demographic variables and ROP type at 9 months and 6 years
| 9 months
|
6 years
|
||||||||
|---|---|---|---|---|---|---|---|---|---|
| Normal | Strabismus | Strabismus % | UA | Normal | Strabismus | Strabismus % | UA | ||
| Birth weight (grams) | <750 | 167 | 73 | 30.4 | 3 | 126 | 94 | 42.7 | 5 |
| 750-999 | 75 | 36 | 32.4 | 2 | 59 | 40 | 40.4 | 3 | |
| ≥1000 | 15 | 1 | 6.3 | 0 | 8 | 7 | 46.7 | 0 | |
|
| |||||||||
| GA (weeks) | <28 | 249 | 105 | 29.7 | 5 | 189 | 134 | 41.5 | 8 |
| 28-31 | 8 | 5 | 38.5 | 0 | 4 | 7 | 63.6 | 0 | |
| >31 | 0 | 0 | --- | 0 | 0 | 0 | --- | 0 | |
|
| |||||||||
| Race | White | 159 | 75 | 32.1 | 2 | 116 | 98 | 45.8 | 6 |
| Black | 46 | 19 | 29.2 | 2 | 35 | 26 | 42.6 | 0 | |
| Other | 52 | 16 | 23.5 | 1 | 42 | 17 | 28.8 | 2 | |
|
| |||||||||
| Sex | Male | 134 | 61 | 31.3 | 4 | 100 | 80 | 44.4 | 6 |
| Female | 123 | 49 | 8.5 | 1 | 93 | 61 | 39.6 | 2 | |
|
| |||||||||
| Born in hospital | Inborn | 217 | 78 | 26.4 | 4 | 158 | 110 | 41.0 | 6 |
| Outborn | 40 | 32 | 44.4 | 1 | 35 | 31 | 47.0 | 2 | |
|
| |||||||||
| Multiple births | Yes | 73 | 33 | 31.1 | 1 | 64 | 37 | 36.6 | 2 |
| No | 184 | 77 | 29.5 | 4 | 129 | 104 | 44.6 | 6 | |
|
| |||||||||
| ROP type | Type 1 | 186 | 83 | 30.9 | 3 | 137 | 107 | 43.9 | 8 |
| Type 2 | 64 | 25 | 28.1 | 2 | 50 | 32 | 39.0 | 0 | |
GA, gestational age; ROP, retinopathy of prematurity; UA, unable to assess: infants deemed unable to assess and not included in the percentage calculations.