Skip to main content

Table 2 Summary statistics of possible systolic blood pressure thresholds in predicting 7-day mortality for the three cohorts

From: Systolic blood pressure and short-term mortality in the emergency department and prehospital setting: a hospital-based cohort study

  Sensitivity Specificity PPV NPV LR+ LR- FP FN FP/FN trade-off *
Emergency department
<90 mmHg 12 (11-14) 99 (99-99) 22 (20-25) 98 (98-98) 15 (14-18) 0.89 (0.87-0.9) 871 1815 1 (ref)
<100 mmHg 19 (17-20) 98 (98-98) 15 (14-16) 98 (98-99) 9.4 (8.5-10) 0.83 (0.81-0.85) 2193 1679 10
<110 mmHg 27 (25-29) 94 (94-95) 8 (8-9) 99 (99-99) 4.8 (4.5-5.2) 0.78 (0.76-0.8) 6116 1512 17
<120 mmHg 36 (33-38) 87 (87-87) 5 (5-5) 99 (99-99) 2.7 (2.6-2.9) 0.74 (0.72-0.76) 14329 1331 28
Ambulance
<90 mmHg 10 (7-13) 99 (98-99) 13 (9-18) 98 (98-98) 6.7 (4.8-9.4) 0.92 (0.88-0.95) 228 321 1 (ref)
<100 mmHg 18 (14-22) 97 (96-97) 11 (8-13) 98 (98-98) 5.2 (4.1-6.5) 0.85 (0.81-0.89) 540 292 11
<110 mmHg 27 (22-32) 92 (92-93) 7 (6-9) 98 (98-98) 3.4 (2.9-4.1) 0.79 (0.74-0.84) 1214 260 16
<120 mmHg 37 (32-43) 84 (83-84) 5 (4-6) 98 (98-99) 2.3 (2-2.6) 0.75 (0.69-0.81) 2540 223 24
MECU
<90 mmHg 16 (14-19) 96 (96-97) 21 (17-24) 95 (95-95) 4.3 (3.6-5.2) 0.87 (0.84-0.9) 440 588 1 (ref)
<100 mmHg 25 (22-29) 93 (92-93) 18 (16-21) 95 (95-96) 3.6 (3.1-4.2) 0.8 (0.77-0.84) 813 524 6
<110 mmHg 34 (31-38) 88 (87-88) 14 (13-16) 96 (95-96) 2.7 (2.5-3.1) 0.75 (0.71-0.79) 1443 462 8
<120 mmHg 43 (40-47) 79 (78-80) 11 (10-12) 96 (95-96) 2.1 (1.9-2.3) 0.72 (0.67-0.76) 2417 398 10
  1. *The FP/FN trade-off expresses the additional number of false positive results for one less false negative result that comes with increasing the systolic blood pressure threshold from 90 mmHg. Values in parentheses are 95% confidence intervals. PPV, positive predictive value; NPV, negative predictive value; LR+, positive likelihood ratio; LR-, negative likelihood ratio; FP, false positives; FN, false negatives; MECU, mobile emergency care unit.