Table 1.
Characteristics of children with sickle cell disease for all subjects and by periodic limb movements in sleep index < 5 and ≥ 5
| Variable | All subjects N = 64 | PLMS < 5/h n = 49 | PLMS ≥ 5/h n = 15 |
|---|---|---|---|
| Age (years) | 8.4 (4.8) | 8.5 (4.7) | 8.2 (5.3) |
| Sex, male (n (%)) | 32 (50) | 24 (49.0) | 8 (53.3) |
| BMI (kg/m2) | 16.9 (2.7) | 17.0 (2.7) | 16.6 (2.8) |
| BMI-z score | −0.20 (1.2) | −0.16 (1.3) | −0.36 (1.0) |
| White blood cell count (109/L) | 13.3 (4.6) | 13.8 (4.6) | 11.9 (4.5) |
| Hemoglobin (g/dL) | 8.2 (1.2) | 8.1 (1.2) | 8.5 (1.3) |
| Reticulocyte count (%) | 14.1 (5.1) | 14.9 (4.9)* | 11.4 (5.3)* |
| Mean red blood cell volume (fl) | 83.9 (7.1) | 83.8 (7.0) | 84.3 (7.5) |
*
P < 0.05 for comparison between subjects with periodic limb movements in sleep (PLMS) < 5/h vs. PLMS ≥ 5/h. Mean (standard deviation) are reported unless otherwise noted. BMI refers to body mass index.