Table 4.
Correlation with ambulatory blood pressure measurement (ABPM) for reliability/reproducibility studies across number of days of readings and time between readings
| Study (first author; publication date) | Measurement schedule | Comparator | N | Correlation coefficient between home systolic/diastolic BP and the comparator measurement | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Time between readings | Number of days (from first day onwards unless otherwise stated) | |||||||||||
| 10 seconds | 1 minute | 1 day | 2 days | 3 days | 4 days | 5 days | 6 days | 7 days | ||||
| Almeida (2014) | 3 days Before-morning micturition and in afternoon: 15 (3 day 1, 6 on days 2 and 3) | 24-hour wakefulness ABPM | 158 | 0.769/0.826 | ||||||||
| 3 days post-morning micturition and evening: 15 (3 day 1, 6 on days 2 and 3) | Before SMBP | 0.722/0.742 | ||||||||||
| Almeida (2013) | 3 days and 33 readings (9 on day 1, 12 on each of day 2 and day 3) | 24-hour ABPM | 158 | 0.76/0.80 | ||||||||
| 5 days and 27 readings (3 on day 1, 6 on days 2–5) | Day before SMBP | 0.61/0.69 | ||||||||||
| Ambrosi (2014) | 7 days (2 readings in the morning and 2 readings in the evening on each day) | 24-hour ABPM | 58 | 0.75/0.62 | 0.71/0.65 (Days 2–7) | |||||||
| Within 15 days end of SMBP | ||||||||||||
| Boivin (2014) | 3 readings without rest, i.e., immediately after positioning cuff (am and pm for 3 days, total 18 readings) | Daytime ABPM | 52 | 0.69/0.66 | ||||||||
| 3 readings 5 minutes after first series (am and pm for 3 days, total 18 readings) | Within 3 days before SMBP | 0.70/0.66 | ||||||||||
| Di Monaco (2016) | 4 days (2 readings in the morning and 2 readings in the evening on each day) | Daytime ABPM Day before SMBP |
310 | 0.57/0.72 | 0.57/0.72 | 0.58/0.72 | 0.59/0.72 | |||||
| 24-hour ABPM Day before SMBP |
0.58/0.71 | 0.58/0.71 | 0.59/0.71 | 0.59/0.72 | ||||||||
| Eguchi (2009) | 4 days per week for 8 weeks (3 readings in the morning and 3 in the evening on each day) | Daytime ABPM | 56 | 0.712/0.693 | 0.725/0.673 | |||||||
| ABPM on second visit during SMBP schedule | ||||||||||||
| Hoffman-Petersen (2015) | 4 days. 3 am (6–8 am), 3 before dinner (5–7 pm), 3 before bedtime (9–11 pm) | Daytime ABPM | 102 | 0.61/0.56 | 0.61/0.55 (days 2–3) | 0.69/0.61 (days 2–4) | ||||||
| Just after completion after SMBP | ||||||||||||
| Johannson (2010) | 7 days (2 readings in the morning and 2 readings in the evening on each day) | 24-hour ABPM | 464 | 0.84/0.82 | 0.87/0.84 | 0.88/0.85 | 0.88/0.86 | 0.89/0.86 | 0.89/0.87 | 0.89/0.87 | ||
| Timing in relationship to SMBP unclear | 0.89/ 0.87 (days 2–3) | 0.87/ 0.85 (days 2–7) | ||||||||||
| Kim (2015)a | 7 days (3 readings in the morning and 3 readings in the evening on each day) | 24-hour ABPM | 266 | 0.80 | 0.79 | 0.79 | ||||||
| McGowan (2010) | 7 days (2 readings in the morning and 2 readings in the evening on each day) | Daytime ABPM | 87 | 0.72/0.89 (days 2–7) | ||||||||
| ABPM and SMBP within total 8-day period (i e., ABPM 1 day before or after SMBP)— some ABPM first and some SMBP first | ||||||||||||
| Muxfeldt (2015) | 5 days (3 am between 6 and 10 am) and 3 pm between 6 and 10 pm) | Daytime ABPM | 240 | 0.68/0.73 (days 2–5) | ||||||||
| SMBP initiated day after ABPM | ||||||||||||
| Nunan (2015) | 7 days (2 readings in the morning and 2 in the evening) | Daytime ABPM | 203 | 0.658/0.707 (days 2–5) | 0.649/0.703 | 0.68/0.71 (days 2–6) | 0.671/0.708 | |||||
| After completing SMBP | ||||||||||||
| Stergiou (1998) | 3 work days per week for 2 weeks (2 readings in the morning and 2 readings in the evening on each day) | Daytime ABPM | 189 | 0.66/0.70 | 0.68/0.73 | 0.68/0.75 | 0.70/0.77 | 0.71/0.78 | 0.71/0.79 | |||
| Some ABPM first and some SMBP first, one after the other | 0.67/0.76 (days 2–3) | 0.69/0.77 (days 2–4) | 0.71/0.79 (days 2–5) |
0.71/0.79 (days 2–6) |
||||||||
| Verberk (2006) | 7 days (3 readings in the morning and 3 readings in the evening, with the first of each triplicate discarded) | Daytime ABPM | 216 | 0.53/0.59 | 0.57/0.61 | 0.60/0.63 | 0.62/0.63 | 0.63/0.66 | 0.64/0.66 | 0.65/0.66 | ||
| Timing vs. SMBP unclear |
0.60/0.61 (days 2–3) | 0.62/0.62 (days 2–4) 0.66/0.66 (days 3–5) 0.66/0.67 (days 4–6) 0.64/0.66 (days 5–7) |
0.64/0.66 (days 2–5) 0.66/0.67 (days 3–6) 0.66/0.67 (days 4–7) |
0.65/0.66 (days 2–6) 0.66/0.67 (days 3–7) |
0.65/0.66 (days 2–7) | |||||||
| 24-hour ABPM | 216 | 0.57/0.61 | 0.62/0.63 | 0.66/0.66 | 0.68/0.66 | 0.69/0.69 | 0.69/0.69 | 0.70/0.69 | ||||
| Timing vs. SMBP unclear | 0.66/0.64 (days 2–3) | 0.69/0.66 (days 2–4) 0.71/0.69 (days 3–5) 0.70/0.69 (days 4–6) 0.69/0.68 (days 5–7) |
0.69/0.69 (days 2–5) 0.71/0.69 (days 3–6) 0.71/0.70 (days 4–7) |
0.69/0.69 (days 2–6) 0.71/0.69 (days 3–7) |
0.70/0.69 (days 2–7) |
Abbreviations: BP, blood pressure; SMBP, self-monitoring of blood pressure.
aConference abstract only. Study provides intraclass correlation coefficient data, not Pearson correlation coefficient data, so is not strictly comparable to other studies.