Table 4 Concordance of BP classification according to cuff and invasive brachial BPa

From: Accuracy of cuff blood pressure and systolic blood pressure amplification

Invasive brachial BP classification

Brachial cuff BP classification

Normal BP

Elevated BP

Stage 1 Hypertension

Stage 2 Hypertension

n(%)

n(%)

n(%)

n(%)

Standard brachial cuff BP

Normal BP

125(55.1)

19(15.7)

9(4.2)

2(0.9)

Elevated BP

59(26.0)

38(31.4)

31(14.4)

6(2.6)

Stage 1 Hypertension

28(12.3)

36(29.8)

86(39.8)

16(6.9)

Stage 2 Hypertension

15(6.6)

28(23.1)

90(41.7)

207(89.6)

(%) Agreement: 57.4%, kappa: 0.42, p < 0.001

Cuff SBP corrected with SBP amplificationb

Normal BP

101(74.3)

36(30.3)

16(7.9)

2(0.6)

Elevated BP

21(15.4)

52(43.7)

43(21.3)

18(5.3)

Stage 1 Hypertension

11(8.1)

22(18.5)

84(41.6)

49(14.5)

Stage 2 Hypertension

3(2.2)

9(7.6)

59(29.2)

269(79.6)

(%) Agreement: 63.7%, kappa: 0.49, p < 0.001

  1. P value for the test comparing two proportions of concordance = 0.005;
  2. BP blood pressure, SBP systolic blood pressure, DBP diastolic blood pressure
  3. aHypertension classification based on 2017 ACC/AHA guidelines: Normal BP: SBP < 120 mmHg and DBP < 80 mmHg; Elevated BP: SBP 120–129 mmHg and DBP < 80 mmHg; Stage 1 Hypertension: SBP 130–139 mmHg or DBP 80–89 mmHg; Stage 2 Hypertension: SBP ≥ 140 mmHg or DBP ≥ 90 mmHg;
  4. Each column adds to 100%;
  5. n (%) represent the number and percentage of concordance for each classification, bolded and italic numbers represent concordant classifications;
  6. bIndividual SBP amplification value was added to each corresponding cuff SBP value before applying ACC/AHA classification
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