Table 2.

Changes in the proportion of grouped 30-day readmission diagnoses by using joinpoint regression analysis

	Trend 1		Change between trends 1 and 2		Trend 2		Change between trends 2 and 3		Trend 3
Conditions as the readmission diagnosis	Total change, %	Change by day, %	Day of the change	P value for the trend change	Total change, %	Change by day, %	Day of the change	P value for the change	Total change, %	Change by day, %
Overall (n=14,090)
Respiratory-related	−4.0%	−0.5%	Day 8	0.06	13.2%	0.6%	–
Cardiac-related	−18.6%	−3.1%	Day 6	0.02	20.8%	1.3%	Day 22	0.01	−16.8%	−2.1%
Other	15.0%	2.5%	Day 6	0.04	−28.8%	−1.2%	–
Age category
Age 65-84 years (n=11,463)
Respiratory-related	15.0%	0.5%	–
Cardiac-related	3.0%	0.1%	–
Other	29.1%	9.7%	Day 3	0.29	−29.7%	−1.1%	–
Age ≥85 years (n=2,627)
Respiratory-related	21.0%	0.7%	–
Cardiac-related	6.0%	0.2%	–
Other	21.6%	1.8%	Day 12	0.18	−32.0%	−8.0%	Day 16	0.21	14.0%	1.0%