Table 2. Correlation between vitamin D and polysomnographic parameters
| 25(OH)D |
| Obese (n=40) | Non-obese (n=69) | Total (n=109) |
| BMI z-score |
| r | 0.03 | –0.23 | –0.24 |
| p-value | 0.84 | 0.06 | 0.01* |
| Age (month) |
| r | –0.44 | –0.10 | –0.26 |
| p-value | 0.01 | 0.44 | 0.01* |
| AHI |
| r | –0.25 | –0.08 | –0.22 |
| p-value | 0.12 | 0.53 | 0.02* |
| AHI obstructive |
| r | –0.36 | –0.14 | –0.26 |
| p-value | 0.02* | 0.25 | 0.01* |
| AHI hypopnea |
| r | –0.25 | –0.13 | –0.25 |
| p-value | 0.12 | 0.31 | 0.01* |
| AHI supine |
| r | –0.27 | –0.14 | –0.26 |
| p-value | 0.10 | 0.26 | 0.01* |
| AHI non-supine |
| r | –0.13 | 0 | –0.13 |
| p-value | 0.43 | 1.0 | 0.18 |
p-values are from the Spearman correlation.
p<0.05.
5(OH)D: 25-hydroxyvitamin D, BMI: body mass index, AHI: apnea-hypopnea index, AHI obstructive: obstructive portion of apnea-hypopnea index, AHI hypopnea: hypopnea portion of apnea-hypopnea index, AHI supine: apnea-hypopnea index in supine position, AHI non-supine: apnea-hypopnea index in non-supine position.