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Table 5 Summary Chi-squared test for severity of nonconformities

From: Impact of ISO/IEC 17025 laboratory accreditation in sub-Saharan Africa: a case study

Total # of Major NCs

χ2

p-value

Pair 1: 2013–2017-2018

84.5

9.99e-05*

Pair 2: 2013–2017

51.96

9.99e-05*

Pair 3: 2013–2018

40.5

9.99e-05*

Pair 4: 2017–2018

1.92

0.2722

  1. Chi-squared test with simulation compared the number of major nonconformities pre-post accreditation, and gave significant p-values when pre-accreditation year (2013) was paired with post-accreditation years 2017 and 2018, respectively. A non-significant p-value was obtained for the major NCs post-accreditation year comparison (2017–2018)
  2. *p is significant < 0.05, *Bonferroni corrected significance level for alpha = 0.5 is 0.05/3 = 0.0167
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BMC Health Services Research

ISSN: 1472-6963

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