Table 1.
The anthropometric and polysomnographic parameters of all patients according to the severity of OSA
| AHI (0-5) | AHI (5-15) | AHI (15-30) | AHI (30-) | P | |
|---|---|---|---|---|---|
| Subjects | 50 | 67 | 89 | 205 | |
| Age, years | 44.36 ± 16.18 | 49.70 ± 11.64 | 49.72 ± 12.98 | 49.45 ± 13.62 | 0.105 |
| Male sex, number (%) | 30 (60 %) | 41 (61.19 %)***** | 69(77.52 %) | 172(83.9 %)***, ***** | 0.000 |
| Current smoking, number (%) | 6(12 %) | 12(17.91 %) | 19(21.35 %) | 44(21.46 %) | 0.445 |
| Antilipimic agents, number (%) | 2(4 %) | 3(4.48 %) | 4(4.49 %) | 14(6.83 %) | 0.772 |
| Antidiabetic agents, number (%) | 1(2 %) | 4(5.97 %) | 6(6.74 %) | 16(7.80 %) | 0.522 |
| Antihypertensive agents, number (%) | 8(16 %) | 12(17.91 %) | 27(30.34 %) | 56(27.32 %) | 0.108 |
| Waist circumference (cm) | 88.70 ± 10.35**, *** | 90.43 ± 8.79****, ***** | 94.58 ± 8.43**, ****, ****** | 98.26 ± 10.27***, *****, ****** | 0.000 |
| BMI (kg/m)2 | 23.94 ± 3.03**, *** | 24.98 ± 3.25***** | 25.94 ± 3.69**, ****** | 27.84 ± 5.93***, *****, ****** | 0.000 |
| AHI | 2.14(0.80-4.25)*, **, *** | 9.30(7.20-12.30)*, ****, ***** | 21.30(18.25-24.25)**, ****, ****** | 52.40(40.95-65.45)***, *****, ****** | 0.000 |
| Mean SpO2 (%) | 96.50 (95.00-97.00)**, *** | 96.00(95.00-96.00)***** | 95.00(94.00-96.00)**, ****** | 92.00(88.00-94.00)***, *****, ****** | 0.000 |
| LaSO2 (%) | 90.00(84.75-92.00)**, *** | 86.00(80.00-88.00)****, ***** | 79.00(75.00-85.50)**, ****, ****** | 67.00(57.00-78.00)***, *****, ****** | 0.000 |
| TS90% (%) | 0.00(0.00-0.36)**, *** | 0.18(0.02-0.78)***** | 0.98(0.10-2.57)**, ****** | 7.60(2.71-17.93)***, *****, ****** | 0.000 |
| ODI | 1.50(0.50-3.40)**, *** | 6.30(3.40-9.40)****, ***** | 15.54(9.58-19.95)**, ****, ****** | 46.20(31.60-62.40)***, *****, ****** | 0.000 |
Normally distributed data (age, waist circumference, BMI) were expressed as mean ± SD skewed data (including, AHI, ODI, TS90 %, LaSO2, mean SpO2) were presented as median (interquartile range). Categorical variables were expressed as number (percentage), OSA obstructive sleep apnea, BMI body mass index, AHI apnea-hypopnea index; mean SpO2: mean nocturnal oxygen saturation, LaSO2 lowest O2 saturation, TS90% the percentage of sleep duration with SpO2 < 90 %, ODI oxygen desaturation index; *: if P < 0.05 between group 0 [AHI (0-5)] and group 1 [AHI(5-15)]; **: if P < 0.05 between group 0 [AHI (0-5)] and group 2 [AHI(15-30)]; ***: if P < 0.05 between group 0 [AHI (0-5)] and group 3[AHI(30-)]; ****: if P < 0.05 between group 1 and group 2; *****: if P < 0.05 between group 1 and group 3; ******: if P < 0.05 between group 2 and group 3