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Table 5 Numbers of patients with postoperative parameter recordings by trial arm (intention-to-treat analysis)

From: Early warning scoring systems versus standard observations charts for wards in South Africa: a cluster randomized controlled trial

Parameter Intervention arm N = 57 patients Control arm N = 57 patients Pvalue OR 95% CI
  Number (%) Number (%)
Respiratory rate recorded 27 (47.4) 2 (3.5) <0.001 24.75 5.50-111.33
Heart rate recorded 57 (100) 57 (100)  
Oxygen saturation recorded 7 (12.3) 2 (3.5) 0.08 3.85 0.76-19.41
Systolic blood pressure recorded 57 (100) 57 (100) 1.00  
Temperature recorded 55 (96.5) 54 (94.7) 1.00 1.53 0.25-9.51
Level of consciousnessa recorded 45 (78.9) 37 (64.9) 0.09 2.03 0.88-4.68
Urine output recorded 49 (86.0) 51 (89.5) 0.57 0.72 0.23-2.23
All vital signs recorded 5 (8.4) 0b (0.0) 0.06 REb 1.10 1.01-1.2
Incomplete recording of all vital signs 52 (91.2) 57 (100)
MEWS trigger should have been reported and was reported, primary outcome 7 (12.3) 2 (3.5) 0.08 0.26 0.05-1.31
MEWS trigger should have been reported and was not reported 50 (87.7) 55 (96.5)    
  1. Note on table:
  2. aLOC was recorded on the MEWS chart as alert (A), responds to voice (V), responds to pain (P), or unresponsive (U). On the existing chart LOC was recorded in patient progress notes as the state of wakefulness (for example ‘drowsy’) on return to ward and not Glasgow Coma Scale assessment, and this applied to 21 out of 57 (36.8%) patients in the intervention wards who did not have the MEWS chart. LOC recordings on the existing charts should be interpreted with caution.
  3. bIf Haldane’s estimator is used to calculate OR this circumvents zero values in cells by adding one half to each cell and gives OR = 12.05 (95% CI: 0.65 to 223.19, P = 0.022). CI, confidence interval; LOC, level of consciousness; MEWS, modified early warning score; OR, odds ratio; RE, risk estimate.