### Abstract

AIMS: To estimate the size of regression to the mean with ambulatory blood pressure (ABP) measurement. METHODS: Participants from five studies who had repeated blood pressure (BP) measurements using office and ambulatory devices were included. Regression to the mean was calculated following participants being grouped by baseline BP categories. Regression dilution ratio was calculated for groups defined by each baseline BP variable. RESULTS: High baseline ABP readings were substantially lower on long-term follow-up, and low baseline readings tended to be higher. Regression to the mean was observed for all ABP parameters; for systolic and diastolic measures; and for intervention and control groups. For example, among those with baseline 24-h SBP of at least 150 mmHg, mean baseline and follow-up BP was 156 and 141 mmHg, respectively; whereas those with baseline 24-h SBP of less than 120 mmHg, mean baseline and follow-up BP was 113 and 119 mmHg, respectively. Regression to the mean was the greatest for night-time ABP. Regression dilution ratios calculated from control groups were 0.52, 0.53, 0.38 and 0.60 for 24-h, daytime, night-time and office SBP, respectively. Similar results were seen for diastolic measures. CONCLUSION: ABP is subject to considerable regression to the mean, which has implications for diagnosis and practise; for example, after initiating treatment for hypertension some of the fall in ABP will be because of regression to the mean. Furthermore, associations of ABP with cardiovascular disease will be substantially underestimated if analyses are not adjusted for regression to the mean, especially for night-time ABP. Replication studies are needed to confirm these findings.

Original language | English |
---|---|

Pages (from-to) | 24-29 |

Number of pages | 6 |

Journal | Journal of Hypertension |

Volume | 37 |

Issue number | 1 |

DOIs | |

Publication status | Published - 1 Jan 2019 |

Externally published | Yes |

### Cite this

*Journal of Hypertension*,

*37*(1), 24-29. https://doi.org/10.1097/HJH.0000000000001977

}

*Journal of Hypertension*, vol. 37, no. 1, pp. 24-29. https://doi.org/10.1097/HJH.0000000000001977

**Regression to the mean of repeated ambulatory blood pressure monitoring in five studies.** / Moore, Myles N.; Atkins, Emily R.; Salam, Abdul; Callisaya, Michele L.; Hare, James L.; Marwick, Thomas H.; Nelson, Mark R.; Wright, Leah; Sharman, James E.; Rodgers, Anthony.

Research output: Contribution to journal › Article › Research › peer-review

TY - JOUR

T1 - Regression to the mean of repeated ambulatory blood pressure monitoring in five studies

AU - Moore, Myles N.

AU - Atkins, Emily R.

AU - Salam, Abdul

AU - Callisaya, Michele L.

AU - Hare, James L.

AU - Marwick, Thomas H.

AU - Nelson, Mark R.

AU - Wright, Leah

AU - Sharman, James E.

AU - Rodgers, Anthony

PY - 2019/1/1

Y1 - 2019/1/1

N2 - AIMS: To estimate the size of regression to the mean with ambulatory blood pressure (ABP) measurement. METHODS: Participants from five studies who had repeated blood pressure (BP) measurements using office and ambulatory devices were included. Regression to the mean was calculated following participants being grouped by baseline BP categories. Regression dilution ratio was calculated for groups defined by each baseline BP variable. RESULTS: High baseline ABP readings were substantially lower on long-term follow-up, and low baseline readings tended to be higher. Regression to the mean was observed for all ABP parameters; for systolic and diastolic measures; and for intervention and control groups. For example, among those with baseline 24-h SBP of at least 150 mmHg, mean baseline and follow-up BP was 156 and 141 mmHg, respectively; whereas those with baseline 24-h SBP of less than 120 mmHg, mean baseline and follow-up BP was 113 and 119 mmHg, respectively. Regression to the mean was the greatest for night-time ABP. Regression dilution ratios calculated from control groups were 0.52, 0.53, 0.38 and 0.60 for 24-h, daytime, night-time and office SBP, respectively. Similar results were seen for diastolic measures. CONCLUSION: ABP is subject to considerable regression to the mean, which has implications for diagnosis and practise; for example, after initiating treatment for hypertension some of the fall in ABP will be because of regression to the mean. Furthermore, associations of ABP with cardiovascular disease will be substantially underestimated if analyses are not adjusted for regression to the mean, especially for night-time ABP. Replication studies are needed to confirm these findings.

AB - AIMS: To estimate the size of regression to the mean with ambulatory blood pressure (ABP) measurement. METHODS: Participants from five studies who had repeated blood pressure (BP) measurements using office and ambulatory devices were included. Regression to the mean was calculated following participants being grouped by baseline BP categories. Regression dilution ratio was calculated for groups defined by each baseline BP variable. RESULTS: High baseline ABP readings were substantially lower on long-term follow-up, and low baseline readings tended to be higher. Regression to the mean was observed for all ABP parameters; for systolic and diastolic measures; and for intervention and control groups. For example, among those with baseline 24-h SBP of at least 150 mmHg, mean baseline and follow-up BP was 156 and 141 mmHg, respectively; whereas those with baseline 24-h SBP of less than 120 mmHg, mean baseline and follow-up BP was 113 and 119 mmHg, respectively. Regression to the mean was the greatest for night-time ABP. Regression dilution ratios calculated from control groups were 0.52, 0.53, 0.38 and 0.60 for 24-h, daytime, night-time and office SBP, respectively. Similar results were seen for diastolic measures. CONCLUSION: ABP is subject to considerable regression to the mean, which has implications for diagnosis and practise; for example, after initiating treatment for hypertension some of the fall in ABP will be because of regression to the mean. Furthermore, associations of ABP with cardiovascular disease will be substantially underestimated if analyses are not adjusted for regression to the mean, especially for night-time ABP. Replication studies are needed to confirm these findings.

UR - http://www.scopus.com/inward/record.url?scp=85057532441&partnerID=8YFLogxK

U2 - 10.1097/HJH.0000000000001977

DO - 10.1097/HJH.0000000000001977

M3 - Article

VL - 37

SP - 24

EP - 29

JO - Journal of Hypertension

JF - Journal of Hypertension

SN - 0263-6352

IS - 1

ER -