Table 2.

Representative Time Points Describing Trajectories of Risk after Hospitalization for Chronic Obstructive Pulmonary Disease among Patients Who Received Invasive, Noninvasive, or No Ventilatory Support

Type of Ventilator Support	Days of Highest Risk	Mean Days for Risk Level to Decline by 50% (95% CI)	Mean Days for Daily Change in Risk to Decline by 95% (95% CI)
No ventilator support
First readmission	2	43 (43–44)	61 (7–95)
Death	4	17 (14–24)	24 (15–55)
Noninvasive ventilation
First readmission	2	39 (37–41)	54 (6–117)
Death	3	4 (3–4)	18 (13–37)
Invasive ventilation
First readmission	2	28 (27–29)	46 (32–88)
Death	3	3 (3–4)	21 (14–41)

Definition of abbreviation: CI = confidence interval.