Table 3.

Comparison of Respiratory Parameters Observed in PSG lab, PSG+STD lab, STD Home, and STD+PSG Lab Recordings (mean ± SD)

	PSG lab	PSG+STD lab	STD HOME	STD+PSG lab	P
AHI	23 ± 24	26 ± 28	23 ± 24	27 ± 23	NS
Apnea Index	12 ± 19	15 ± 22	13 ± 20	15 ± 20	NS
Hypopnea Index	11 ± 11	11 ± 14	9 ± 6	11 ± 8	NS
Mean SpO2, %	94 ± 2	94 ± 2	95 ± 2	95 ± 2	NS
Nadir SpO2, %	83 ± 9*	82 ± 10#	80 ± 9	78 ± 11*#	0.01
Time SpO2 below 90%, min	22 ± 43	25 ± 50	21 ± 47	18 ± 41	NS
Desaturation Index, number of 3% drops in SpO2 per hour of sleep	17 ± 22	20 ± 25	14 ± 19	16 ± 19	NS

PSG = polysomnography; STD = Stardust portable monitor; AHI = apnea-hypopnea index.

^*P = 0.002;

^#P = 0.01