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Table 3 The Mann-Whitney U test for the median scores of level of knowledge differences of between categories of predictor variables (N = 166)

From: Evaluations of knowledge, skills and practices of insulin storage and injection handling techniques of diabetic patients in Ethiopian primary hospitals

Variables Overall knowledge score
Median (IQR) Mann-Whitney U test Z-score P-value
Sex
 Male     0.291
 Female     
Residence
 Urban 10 (8–12) 2410 −3.36 0.001*
 Rural 8 (7–10)    
Getting of insulin
 Free 8 (7–10) 1874 −5.01 < 0.001*
 Payment 10 (9–12)    
Trained on insulin injection
 Yes     0.075
 No     
Mocking the injection technique during first training
 Yes 9.5 (8–12) 1959.5 −2.41 0.016*
 No 8.5 (6–10)    
  1. * Statistically significant effect on patients’ knowledge levels at p < 0.05