Table 3.

Difference-in-differences for estimated total payments in matched cohort.

Estimated Total Payments ($)	Year Before PAP (Nonadherent – Adherent)	Year(s) After PAP (Nonadherent – Adherent)	Difference-in-Differences*
12 months after PAP
Estimated total payments	47 (−340, 431)	722 (216, 1,226)	675 (107, 1,249)
Estimated total payments – no OSA†	39 (−342, 419)	1,174 (671, 1,677)	1,135 (565, 1,702)
24 months after PAP
Estimated total payments	47 (−340, 431)	1,457 (518, 2,364)	1,410 (500, 2,335)
Estimated total payments – no OSA†	39 (−342, 419)	2,321 (1,386, 3,223)	2,282 (1,368, 3,205)

Values are mean (95% confidence interval). *Difference-in-differences estimates of mean estimated total payments using 10,000 bootstrap samples of the difference between post and pre year for paired differences (nonadherent – adherent) in the matched cohort. The 95% bootstrap confidence interval for the estimate is also shown. †Does not include sleep test and apnea equipment estimated payments. OSA = obstructive sleep apnea, PAP = positive airway pressure.