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Table 5 Analysis of variance for the SAPS scores for ICU patients according to presence of infection on ICU admission and/or ICU-acquired infection

From: Statistics review 9: One-way analysis of variance

Source of variation

df

SS

MS

F

P

Between infections

3

1780.2

593.4

2.84

0.038

Error (within infections)

396

82,730.7

208.9

  

Total

399

84,509.9

   
  1. The P value of 0.038 indicates a significant difference between at least two of the infection means. df, degrees of freedom; F, test statistic; ICU, intensive care unit; MS, mean squares; SAPS, Simplified Acute Physiology Score; SS, sums of squares.