Demographics of preterm neonates with PWMLs and controlsa
| PWML Grade I (n = 15) | Controls (n = 15) | P Value | PWML Grade II (n = 9) | Controls (n = 9) | P Value | PWML Grade III (n = 9) | Controls (n = 9) | P Value | |
|---|---|---|---|---|---|---|---|---|---|
| GA (wk) | 34 + 2 | 34 + 1 | .21 | 33 + 6 | 33 + 6 | .76 | 33 + 0 | 33 + 2 | .37 |
| (32 + 0∼35 + 6) | (32 + 6∼36 + 2) | (30 + 5∼34 + 5) | (30 + 1∼35 + 0) | (32 + 3∼35 + 4) | (32 + 1∼35 + 6) | ||||
| Postnatal age at scan (days) | 8 | 8 | .53 | 10 | 10 | .67 | 10 | 9 | .80 |
| (1∼13) | (1∼13) | (6∼14) | (8∼14) | (4∼13) | (1∼14) | ||||
| PMA (wk) | 35 + 5 | 36 + 0 | .32 | 35 + 3 | 35 + 1 | .23 | 34 + 5 | 35 + 2 | .40 |
| (33 + 1∼37 + 2) | (33 + 3∼37 + 1) | (32 + 1∼36 + 0) | (32 + 1∼36 + 4) | (33 + 1∼36 + 3) | (32 + 5∼36 + 5) | ||||
| Birth weight (g) | 1780 | 1760 | .22 | 1950 | 1750 | .26 | 1920 | 1700 | .51 |
| (1470∼2360) | (1410∼2400) | (1480∼2700) | (1460∼2360) | (1650∼2760) | (1460∼2570) | ||||
| Sex (male/female) | 10:5 | 10:5 | – | 4:5 | 4:5 | – | 3:6 | 3:6 | – |
Note:—GA indicates gestational age; PMA, postmenstrual age.
↵a GA, PMA, and birth weight values are medians (ranges). Values in the row of sex are subject numbers. Wilcoxon signed rank tests were used to test the group difference between each grade of PWML and its matched control group due to non-normal distributions of variables. The sex ratios were not tested because they were the same in PWML and the corresponding control groups.