Table 2.
Initial (baseline) and final (3 months) polygraphy data in G1 and G2 patients (restricted to patients without positive airway pressure treatment)
| G1 + G2 (n = 45) | |||||
|---|---|---|---|---|---|
| n | Initial | Final | Difference | P value | |
| AHI (events/h) | 45 | 24.20 (16.40–43.50) [8.10–67.00] | 20.40 (12.70–31.10) [1.00–55.00] | −7.10 (−16.10 to 0.40) [−30.50 to 32.20] | <0.001 a |
| AHI < 15, n (%) | 45 | 9 (20.00) | 17 (37.78) | — | 0.057 b |
| dAHI (events/h) | 41 | 29.40 (17.20–48.60) [0.00–66.00] | 27.30 (15.90–40.40) [0.00–58.30] | −2.30 (−13.30 to 3.80) [−66.00 to 54.70] | 0.095 a |
| AHIobstructive (events/h) | 45 | 4.20 (1.30–10.00) [0.00–27.00] | 5.60 (3.60–10.00) [0.00–49.20] | 0.40 (−3.50 to 5.20) [−20.90 to 44.80] | 0.611 a |
| AHIcentral (events/h) | 45 | 13.60 (8.20–31.80) [0.00–51.40] | 7.00 (3.10–16.60) [0.00–45.00] | −8.00 (−13.50 to −0.30) [−44.40 to 20.20] | <0.001 c |
| OAI (events/h) | 45 | 1.30 (0.10–4.00) [0.00–16.20] | 1.40 (0.60–4.00) [0.00–49.10] | 0.00 (−1.00 to 1.90) [−15.40 to 45.70] | 0.378 a |
| CAI (events/h) | 45 | 4.00 (1.50–20.50) [0.00–46.10] | 2.10 (0.50–5.50) [0.00–45.00] | −1.50 (−9.50 to 0.20) [−45.00 to 20.20] | <0.001 a |
| MAI (events/h) | 45 | 0.10 (0.00–1.40) [0.00–31.00] | 0.40 (0.00–1.50) [0.00–39.00] | 0.00 (−0.40 to 0.60) [−28.50 to 15.00] | 0.724 a |
| HI (events/h) | 44 | 13.45 (7.90–17.75) [2.50–38.70] | 8.45 (4.90–15.40) [0.40–42.80] | −3.55 (−7.85 to 0.45) [−18.90 to 33.20] | 0.014 a |
| HIobstructive (events/h) | 45 | 1.70 (0.50–6.70) [0.00–20.00] | 2.20 (0.70–6.20) [0.00–21.90] | 0.00 (−0.90 to 1.90) [−17.40 to 17.40] | 0.811 a |
| HIcentral (events/h) | 45 | 7.20 (2.10–11.30) [0.00–29.80] | 3.10 (0.50–7.40) [0.00–29.60] | −2.10 (−7.20 to 0.60) [−15.80 to 28.20] | 0.024 a |
| ODI (events/h) | 42 | −6.32 (±15.79) | −6.20 (−12.70 to 0.90) | [−43.50 to 39.20] | 0.013 c |
| Mean SpO2 (%) | 44 | 92.30 (91.35–94.55) [87.90–96.80] | 93.05 (91.60–94.70) [88.90–99.60] | 0.60 (−1.05 to 1.50) [−4.00 to 8.10] | 0.247 a |
| Minimum SpO2 (%) | 43 | 83.00 (78.00–86.00) [0.00–91.00] | 84.00 (81.00–87.00) [60.00–93.00] | 1.00 (−1.00 to 4.00) [−11.00 to 60.00] | 0.036 a |
| Time SpO2 < 90% (min) | 44 | 23.00 (5.00–96.50) [0.00–311.00] | 13.50 (2.50–67.50) [0.00–344.00] | −4.00 (−36.50 to 4.00) [−279.00 to 231.00] | 0.129 a |
| Time SpO2 < 90% (%) | 44 | 8.10 (1.00–22.95) [0.00–81.00] | 2.85 (0.40–12.75) [0.00–60.90] | −1.05 (−10.80 to 0.90) [−79.80 to 37.20] | 0.020 a |
AHI, apnoea–hypopnoea index; CAI, central apnoea index; dAHI, dorsal apnoea–hypopnoea index; HI, hypopnoea index, MAI, mixed apnoea index; OAI, obstructive apnoea index; ODI, oxygen desaturation index; SpO2, oxygen saturation on pulse oximetry.
Quantitative variables were described by medians and (IQ25–75) and [min–max].
a
The statistical tests used are presented on P values for Wilcoxon paired test.
b
The statistical tests used are presented on P values for McNemar's test with Yates' corrections.
c
The statistical tests used are presented on P values for Student's paired test.