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Table 1 Description of Variables Used in the Model and Estimated Values. Costs are in Canadian dollars

From: Revisiting level II sleep studies in the era of COVID-19: a theoretical economic decision model in patients with suspected obstructive sleep apnea

Variable

Description of Variable

Estimated Value

A

Proportion of patients with OSA intolerant/do not improve on CPAP

0.3

B

Proportion of patients intolerant/do not improve on CPAP who require PSG after their original PSG/LII

0.4

C

Cost of PSG

$555

D

Cost of CPAP trial

$0

E

Rate of nondiagnostic LIII

0.1

F

Sensitivity of LIII

0.85

G

Specificity of LIII

0.85

H

Proportion of patients intolerant/do not improve on CPAP who require only one PSG/LII after initial LIII

0.6

1-H

Proportion of patients intolerant/do not improve on CPAP who require an additional PSG (after initial portable study and follow up PSG/LII)

0.4

I

Cost of LIII

$167

J

Rate of nondiagnostic LII

0.15

K

Cost of LII

$300