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Table 5 Sensitivity analyses for standardisation with matched analysis (Systolic BP)

From: Examining the effectiveness of telemonitoring with routinely acquired blood pressure data in primary care: challenges in the statistical analysis

 

Matching criterion for Systolic BP

Adjustment to surgery Systolic BP readingsa

N

Systolic BP

Mean difference

95% confidence interval

P-value

1

Nearest SBP with end digit 0 or 5

0

212

7.11

5.03 to 9.19

< 0.001

2

Nearest SBP with end digit 0 or 5

−7

201

4.01

1.47 to 6.56

0.002

3

Nearest SBP with end digit 0 or 5

−10

211

1.83

−0.55 to 4.21

0.131

4

Exact SBP matching

0

119

5.70

2.78 to 8.61

< 0.001

5

Exact SBP matching

−5

120

5.67

2.24 to 9.09

0.001

6

Exact SBP matching

−7

128

2.25

−0.67 to 5.17

0.130

7

Exact SBP matching

−10

123

2.23

−0.74 to 5.19

0.140

8

Nearest SBP with end digit 0

−5

208

3.90

1.39 to 6.42

0.003

9

Nearest SBP with end digit 0

−7

209

2.90

0.53 to 5.28

0.017

  1. aAdjustment was applied to matching values as well as final values