Table 3

Cost outcomes from interrupted time series analysis

OutcomeTime
(95% CI)		P valueIntervention (95% CI)P valueTime after intervention (95% CI)P value
Total variable direct costs, all patients, per cent change per month, n=160 434Unadjusted0.06
(−0.07 to 0.18)		0.36−0.05
(−3.19 to 3.20)		0.98−0.02
(−0.16 to 0.13)		0.82
Adjusted for all but DRG weight0.20
(0.09 to 0.32)		0.0010.40
(−2.58 to 3.46)		0.80−0.27
(−0.40 to −0.14)		<0.001
Fully adjusted−0.02
(−0.10 to 0.06)		0.661.95
(−0.12 to 4.06)		0.07−0.22
(−0.31 to −0.13)		<0.001
Total variable direct costs, medical DRGs, per cent change per month, n=100 684Unadjusted0.0001
(−0.18 to 0.18)		1.001.59
(−2.84 to 6.22)		0.49−0.02
(−0.22 to 0.18)		0.85
Adjusted for all but DRG weight0.10
(−0.07 to 0.26)		0.26−0.17
(−4.36 to 4.20)		0.94−0.15
(−0.34 to 0.04)		0.13
Fully adjusted0.01
(−0.11 to 0.12)		0.910.51
(−2.31 to 3.41)		0.73−0.20
(−0.33 to −0.08)		<0.001
Total variable direct costs, surgical DRGs, per cent change per month, n=59 750Unadjusted0.26
(0.10 to 0.41)		0.0020.31
(−3.66 to 4.44)		0.88−0.24
(−0.42 to −0.06)		0.009
Adjusted for all but DRG weight0.44
(0.29 to 0.58)		<0.0010.68
(−3.06 to 4.56)		0.72−0.50
(−0.66 to −0.33)		<0.001
Fully adjusted0.11
(0.01 to 0.21)		0.032.71
(0.10 to 5.38)		0.04−0.37
(−0.48 to −0.26)		<0.001

  • All results are adjusted for age, sex, race/ethnicity, DRG weight, comorbidity, medicine versus surgery and payer, unless otherwise noted.

  • DRG, diagnosis related group.