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Table 4 Summary Chi-squared test for paired years

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

# of NCs

χ2

p (2-tailed)

Cohen’s d

effect-size r

Pair 1: 2013–2017

73.96

9.99e-05*

1.796

0.668

Pair 2: 2013–2018

58.33

9.99e-05*

1.592

0.623

Pair 3: 2017–2018

2.33

0.198

  
  1. Chi-squared test with simulation, compared the number of nonconformities (NCs) pre-post accreditation, gave significant p-values when pre-accreditation year (2013) was paired with post-accreditation years, 2017 and 2018 respectively. Non-significant p-value was obtained for post accreditation years comparison
  2. *p is significant < 0.05, NB: Bonferroni corrected significance level for alpha = 0.5 is 0.05/3 = 0.017
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BMC Health Services Research

ISSN: 1472-6963

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