Table 4.
Correlation between iron status biomarkers and CSHQ total score and subscales in the ADHD group (Spearman’s correlation test was used for ferritin, and iron; Pearson’s correlation test was used for transferrin).
| CSHQ Total | Bedtime Resistance |
Sleep Onset Delay |
Sleep Duration |
Sleep Anxiety | Night Wakings |
Parasomnias | SDB | Daytime Sleepiness |
||
|---|---|---|---|---|---|---|---|---|---|---|
| Ferritin (ng/mL) |
Rho p-value |
0.114 0.435 |
0.132 0.365 |
0.036 0.806 |
−0.088 0.547 |
0.244 0.091 |
0.099 0.498 |
0.048 0.743 |
−0.044 0.766 |
0.081 0.580 |
| Transferrin (mg/dL) |
r p-value |
0.126 0.389 |
0.005 0.972 |
−0.057 0.699 |
−0.025 0.862 |
0.100 0.495 |
0.077 0.601 |
−0.044 0.763 |
0.141 0.333 |
0.181 0.214 |
| Iron (µg/dL) |
Rho p-value |
0.017 0.908 |
0.049 0.738 |
0.115 0.430 |
0.042 0.774 |
0.121 0.407 |
−0.201 0.167 |
−0.048 0.746 |
0.222 0.125 |
0.010 0.943 |
SDB: sleep-disordered breathing.