Characteristics of babies who did and who did not complete all eye examinations, by study period
| Period 1 | Period 2 | Period 3 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Completed all examinations (n=435) | Did not complete all examinations (n=142) | Completed all examinations (n=307) | Did not complete all examinations (n=107) | Completed all examinations (n=398) | Did not complete all examinations (n=143) | ||||||||||
| Mean | SD | Mean | SD | p Value | Mean | SD | Mean | SD | p Value | Mean | SD | Mean | SD | p Value | |
| Birthweight | 1804.3 | 560.9 | 1548.1 | 528.0 | <0.001 | 1778.8 | 567.7 | 1746.7 | 540.6 | 0.61 | 1907.8 | 615.2 | 1762.6 | 618.0 | 0.01 |
| Gestational age | 33.2 | 2.4 | 32.3 | 2.2 | <0.001 | 33.3 | 2.5 | 33.1 | 2.2 | 0.41 | 33.7 | 2.3 | 32.9 | 2.6 | 0.01 |