Table 3.
Proportion and frequency of IOS and POS in the right and left hemispheres in participants born EP/ELBW and controls
| Right hemisphere | Left hemisphere | |||
|---|---|---|---|---|
| EP/ELBW (n = 194) n (%) | Controls (n = 147) n (%) | EP/ELBW (n = 194) n (%) | Controls (n = 147) n (%) | |
| Number of IOS | ||||
| 0 | 3 (1) | 5 (3) | 4 (2) | 3 (2) |
| 1 | 101 (53) | 70 (48) | 101 (52) | 60 (40) |
| 2 | 82 (42) | 64 (44) | 82 (42) | 66 (45) |
| 3 | 8 (4) | 8 (5) | 7 (4) | 17 (12) |
| 4 | 0 (0) | 0 (0) | 0 (0) | 1 (1) |
| MD, R, IQR | (1,3,1) | (1,3,1) | (1,3,1) | (2,4,1) |
| Mann–Whitney U | U = 0.37 | P = 0.72 | U = 2.57 | P = 0.010 |
| Number of POS | ||||
| 0 | 63 (32) | 54 (37) | 56 (29) | 60 (41) |
| 1 | 103 (53) | 72 (49) | 104 (54) | 74 (50) |
| 2 | 27 (14) | 19 (13) | 32 (16) | 12 (8) |
| 3 | 1 (1) | 2 (1) | 2 (1.0) | 1 (1) |
| MD, R, IQR | (1,3,1) | (1,3,1) | (1,3,1) | (1,3,1) |
| Mann–Whitney U | U = −0.63 | P = 0.53 | U = −2.80 | P = 0.005 |
Note: EP/ELBW – extremely preterm/extremely low birth weight; IOS – intermediate orbital sulci; POS – posterior orbital sulci; MD – median; R – range; IQR; interquartile range.