stolic blood pressure was similar in the right and left arms (161 mmHg versus 160 mmHg, t = 1.78, bootstrap P = 0.074, Table 2 ). In 279 patients (39.3%), there was a ≥10 mmHg systolic inter-arm difference, with the right arm having the higher reading most often (156/279 [56%] versus 123/279 [44%], Table 3 ). Table 2. Systolic and diastolic blood pressure in the left and right arms and compared to mean daytime pressure measured by ambulatory blood pressure monitor ( n = 710) Variable Mean SE mean SD Median Screening SBP and DBP in the left and right arms Right arm SBP 161.0 0.9 22.8 158.0 Left arm SBP 160.1 0.9 23.6 157.0 Right — left arm SBP 0.9 0.5 12.9 1.0 Right arm DBP 88.7 0.5 12.9 88.0 Left arm DBP 88.0 0.5 12.7 87.5 Right — left arm DBP 0.7 0.3 8.8 3.0 Highest and lowest SBP and DBP and right and left arm SBP and DBP versus mean daytime pressure measured by ABPM Higher SBP — daytime ABPM 25.1 0.7 18.8 23.0 Lower SBP — daytime ABPM 15.5 0.7 18.1 13.0 Right arm SBP — daytime ABPM 20.7 0.7 18.8 19.0 Left arm SBP — daytime ABPM 19.9 0.7 19.4 18.0 Higher DBP — daytime ABPM 7.7 0.4 10.8 7.0 Lower DBP — daytime ABPM 1.2 0.4 10.0 1.0 Right arm DBP — daytime ABPM 4.8 0.4 11.1 4.0 Left arm DBP — daytime ABPM 4.1 0.4 10.7 3.0 Open in a new tab ABPM = ambulatory blood pressure monitoring. DBP = diastolic blood pressure. SBP = systolic blood pressure. SD = standard deviation. SE = standard error. Table 3. Inter-arm systolic and diastolic blood pressure differences Blood pressure difference Count, n = 710 % Left SBP > right SBP by ≥10 mmHg 123 17.3 < 10 mmHg difference between left and right SBP 431 60.7 Right SBP > left SBP by ≥10 mmHg 156 22.0 Left DBP > right DBP by ≥10 mmHg 78 11.0 < 10 mmHg difference between left and right DBP 534 75.2 Right DBP > left DBP by≥10 mmHg 98 13.8 Absolute systolic inter-arm difference (mmHg) 0–4 222 31.3 5–9 209 29.4 10–19 197 27.7 >20 82 11.6 Total 710 100.0 Open in a new tab DBP = diastolic blood pressure. SBP = sys