Table 3– Polysomnography results from the baseline continuous positive airway pressure (CPAP) night for patients with and without initial complex sleep apnoea (CompSA)

	CompSA	No CompSA	p-value
Subjects n	82	593
TST min	341.3±67.8	350.1±69.8	0.203
SE %	71.0±11.7	74.1±12.7	0.010*
SL min	31.7±25.2	29.8±27.5	0.232
N1 %	11.2±8.8	8.7±6.9	0.015*
N2 %	44.8±12.8	45.5±11.9	0.471
N3 %	22.1±10.5	23.5±10.1	0.263
REM %	21.9±6.7	22.4±7.0	0.635
WASO min	113.7±72.1	97.6±63.5	0.006*
Arousal index events·h⁻¹	28.3±15.1	22.7±13.2	<0.001*
Awakenings n	42.3±20.4	34.4±15.3	0.001*
Mean S_a,O₂ %	94.4±2.0	94.6±1.8	0.863
CPAP pressure cmH₂O	7.5±1.6	7.4±1.8	0.501
AHI events·h⁻¹	10.4 (7.5–17.1)	2.0 (0.5–4.3)	<0.001*
AI events·h⁻¹	7.8 (6.5–12.5)	0.6 (0.0–2.0)	<0.001*
HI events·h⁻¹	0.9 (0.0–4.2)	0.7 (0.0–2.4)	0.226
OAI events·h⁻¹	0.0 (0.0–0.1)	0.0 (0.0–0.0)	0.134
MAI events·h⁻¹	0.1 (0.0–0.5)	0.0 (0.0–0.1)	<0.001*
CAI events·h⁻¹	7.4 (6.0–10.9)	0.3 (0.0–1.4)	<0.001*
Patients with periodic breathing %	41.5	0.0	<0.001*

Data are presented as mean±sd or median (interquartile range), unless otherwise stated. TST: total sleep time; SE: sleep efficiency; SL: sleep latency; N1: sleep stage 1; N2: sleep stage 2; N3: sleep stage 3; REM: rapid eye movement; WASO: wake after sleep onset; S_a,O₂: arterial oxygen saturation; AHI: apnoea/hypopnoea index; AI: apnoea index; HI: hypopnoea index; OAI: obstructive apnoea index; MAI: mixed apnoea index; CAI: central apnoea index. *: p<0.05, which was considered significant.