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Table 3 Number of abnormal vital signs recorded per patient (intention-to-treat analysis)

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

Number of abnormal vital signs Intervention arm % Control arm %
n n
0 9 15.79 12 21.05
1 19 33.33 26 45.61
2 17a 29.82 13 22.81
3 10 17.54 6 10.53
4 2 3.51 0  
Total 57 100 57 100
  1. aTwo patients died.
  2. No significant differences identified, df = 4, χ2 5.05, P = 0.28. df, the degrees of freedom, or the number of ‘entities’ that are free to vary when a statistical test is applied; this also determines the probability distribution used for the test statistic.