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Table 2 Statistical comparison of the length of stay data (days) in period 1 (2016/17) and period 2 (2017/18) of patients admitted to QEHB with influenza-like illness, using a Mann Whitney U test, with Holm’s correction for multiple comparisons

From: Impact of a PCR point of care test for influenza A/B on an acute medical unit in a large UK teaching hospital: results of an observational, pre and post intervention study

Comparison Median 1 Median 2 p-value
D vs C 3.75 5.16 0.183
D vs B 3.75 8.61 1.59 × 10−6
D vs A 3.75 9.01 0.166
C vs B 5.16 8.61 0.535
C vs A 5.16 9.01 0.720
B vs A 8.61 9.01 0.812
  1. Key: A, lower respiratory tract infection and influenza in period 1; B, influenza in period 1; C, lower respiratory tract infection and influenza in period 2; D, influenza in period 2
  2. Note: A Kruskal-Wallis test was used on the data, to see whether there was evidence of disparity in the median length of stay for the different groups. Next, pairwise comparisons amongst the groups, looking for evidence that the medians were disparate was performed. The tests used here were Mann-Whitney U tests, with Holm’s correction for multiple comparisons. The table displays the results for the comparisons