Table 2.
Correlation analysis between serum neurofilament light (NfL) levels and other parameters
| Variables | NfL levels | |
|---|---|---|
| Spearman correlation | P | |
| Course of snoring | 0.354 | < 0.001*** |
| Course of mouth breathing | 0.193 | 0.049* |
| Course of choking | 0.313 | 0.001** |
| A/N | 0.395 | < 0.001*** |
| Tonsil size | 0.260 | 0.007** |
| AHI | 0.647 | < 0.001*** |
| OAI | 0.452 | < 0.001*** |
| OAHI | 0.631 | < 0.001*** |
| Minimum SaO2 | -0.430 | < 0.001*** |
| RAI | 0.504 | < 0.001*** |
| VIQ | -0.447 | < 0.001*** |
| PIQ | -0.480 | < 0.001*** |
| FIQ | -0.388 | < 0.001*** |
A/N Adenoidal hypertrophy/nasopharyngeal cavity, AHI Apnea–hypopnea index, OAI Obstructive apnea index, OAHI The obstructive apnea–hypopnea index, SaO2 Arterial oxygen saturation, RAI Respiratory arousal index, VIQ Verbal IQ, PIQ Performance IQ, FIQ Full-Scale IQ. Tonsil size: Grade 0, tonsils restricted into the tonsil fossae; Grade 1, tonsils sitting just outside of the tonsillar fossa and occupying ≤ 25% of the area between the tonsillar pillars; Grade 2, tonsils seen in the airway and occupying 25-50% of the area between the pillars; Grade 3, tonsils occupying 50%-75% of the area between the pillars; and grade 4, tonsils occupying > 75% of the area between the pillars. ***P < 0.001, **P < 0.01, *P < 0.05