Peripheral arterial tonometry versus polysomnography in suspected obstructive sleep apnoea

Table 3 Comparison of PAT and PSG sleep parameters stratified by matched concordant and discordant patients

Parameter	Concordant		p-value^a	Discordant		p-value^a
Parameter	PAT; avg ± SEM	PSG; avg ± SEM	p-value^a	PAT; avg ± SEM	PSG; avg ± SEM	p-value^a
Sleep time (min)	345 ± 3.3	303 ± 3.0	< 0.001	351 ± 6.5	296 ± 6.1	< 0.001
AHI (/h)	34 ± 0.7	27 ± 0.9	< 0.001	19 ± 0.8	2 ± 0.1	< 0.001
ODI (/h)	22 ± 0.7	27 ± 1.1	< 0.001	9 ± 0.6	3 ± 0.3	< 0.001
Awake (%)	17 ± 0.3	26 ± 0.7	< 0.001	18 ± 0.7	24 ± 1.2	< 0.001
REM (%)	23 ± 0.3	16 ± 0.3	< 0.001	23 ± 0.6	16 ± 0.5	< 0.001
Deep sleep (%)	15 ± 0.3	21 ± 0.5	< 0.001	18 ± 0.5	25 ± 0.9	< 0.001
Time SpO₂ < 90% (min)	28 ± 2.1	41 ± 2.6	< 0.001	15 ± 3.2	15 ± 2.9	0.158
Mean saturation (%)	93 ± 0.1	92 ± 0.2	< 0.001	94 ± 0.2	94 ± 0.2	0.123
Snore (%)	21 ± 0.9	10 ± 0.6	< 0.001	12 ± 1.5	3 ± 0.7	< 0.001

Values in bold indicate significant p-values
AHI apnoea hypopnoea index, ODI oxygen desaturation index, REM rapid eye movement, PAT peripheral arterial tonometry, PSG polysomnography, SpO₂ oxygen saturation
^aThe Mann–Whitney U-test was used to evaluate the comparisons

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