Table 2.
Sign and symptoms of OSA and polysomnographic parameters in relation to the presence of OSA or PA.
| Variables | OSA (-) PA (-) n = 104 | OSA (+) PA (-) n = 74 | OSA (-) PA (+) n = 9 | OSA (+) PA (+) n = 20 | P OSA (+) PA (-) vs OSA (+) PA (+) | P * |
|---|---|---|---|---|---|---|
| Increased neck circumference (%) | 40.4 | 67.6 | 44.4 | 85.0 | .13 | <.001† |
| ESS | 7 (5–9.75) | 6 (4–10.5) | 4 (1.5–10) | 7 (4–10) | .93 | .67‡ |
| Total sleep time (h) | 6.9 ± 1.5 | 6.9 ± 1.7 | 6.6 ± 1.4 | 6.7 ± 1.7 | .68 | .62§ |
| AHI (events/h) | 5.6 ± 4.1 | 36.6 ± 19.4 | 5.2 ± 4.9 | 37.9 ± 15.8 | .78 | <.001‡ |
| ODI (events/h) | 6.8 ± 6.8 | 35.1 ± 21.4 | 6.5 ± 7.2 | 32.5 ± 15.9 | .78 | <.001‡ |
| Mean SpO2, (%) | 94.5 ± 1.8 | 92.7 ± 2.0 | 93.8 ± 1.3 | 92.8 ± 2.1 | .76 | <.001‡ |
| Min SpO2, (%) | 87.1 ± 5.9 | 78.3 ± 9.5 | 87.4 ± 3.2 | 78.0 ± 8.2 | .90 | <.001‡ |
| T90 (%) | 10.3 ± 37.2 | 45.9 ± 61.0 | 9.3 ± 22.3 | 44.0 ± 54.5 | .90 | <.001‡ |
| No. of microarousals (/h) | 28.3 ± 15.2 | 41.5 ± 30.6 | 24.3 ± 16.2 | 38.9 ± 20.3 | .91 | <.001‡ |
The results are reported as mean ± standard deviation or median (25th–75th percentiles) and frequency as a percentage. Increased neck circumference was defined as circumference ≥ 43 cm for men and ≥ 41 cm for women. *For comparison between four groups. †Chi-square test. ‡Kruskal-Wallis Test. §Univariate analysis of variance with post hoc Duncan’s multiple range test. AHI = apnea-hypopnea index, ESS = Epworth Sleepiness Scale, ODI = oxygen desaturation index, OSA = obstructive sleep apnea, PA = primary aldosteronism, SpO2 = peripheral capillary oxygen saturation, T90 = sleep-time spent with oxygen saturation.