Table 4.

Interrupted Time Series Analysis for Mean Systolic and Diastolic Blood Pressure

	Blood Pressure, mm Hg (95% CI)
Parameter	All Patients	White	Black	South Asian
Systolic
Pre-QOF trend	−0.03 (−0.31 to 0.25)	−0.50 (−0.93 to −0.08)a	0.31 (−0.20 to 0.83)	0.42 (−0.16 to 1.01)
Level change post-QOF	−1.95 (−2.87 to −1.02)b	−2.12 (−3.48 to −0.77)b	−2.32 (−4.03 to −0.61)b	−1.08 (−2.97 to 0.08)
Post-QOF trend	−1.04 (−1.42 to −0.64)b	−0.21 (−0.80 to 0.37)	−1.68 (−2.41 to −0.95)b	−1.79 (−2.60 to −0.98)b
Diastolic
Pre-QOF trend	−0.84 (−1.00 to −0.67)b	−0.69 (−0.93 to −0.44)b	−0.84 (−1.14 to −0.54)b	−1.06 (−1.41 to −0.72)b
Level change post-QOF	−0.51 (−1.05 to 0.01)	−1.01 (−1.79 to −0.24)a	−0.33 (−1.32 to 0.65)	0.20 (−0.90 to 1.30)
Post-QOF trend	0.19 (−0.03 to 0.41)	0.10 (−0.23 to 0.43)	0.12 (−0.30 to 0.54)	0.40 (−0.07 to 0.87)

QOF = Quality and Outcomes Framework.

^aP <.05

^bP <.01