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Table 4 Wilcoxon Matched-Pairs Signed Rank Test comparing pretest and posttest self-reported scores

From: Medication adherence support of an in-home electronic medication dispensing system for individuals living with chronic conditions: a pilot randomized controlled trial

Question n Baseline – M1
Median (IQR)
6-month - M2
Median (IQR)
Z p-value
In the last 30 days, did you find it challenging to take your medication(s) on time?a
Intervention 16 3.00 (2) 1.00 (2) −2.28 0.02d
Control 15 3.00 (1) 2.00 (2) −2.78 < 0.01d
In the last 30 days, did you take your medication(s) at a different time than prescribed?a
Intervention 16 3.00 (2) 2.00 (2) −1.35 0.18
Control 15 3.00 (3) 1.00 (1) −2.43 < 0.01d
In the last 30 days, did you miss taking any medication(s)?a
Intervention 16 2.00 (2) 1.00 (1) −2.70 < 0.01d
Control 15 3.00 (1) 2.00 (1) −2.23 0.03d
In the last 30 days, please rate your medication adherence (taking your medication on time) on a scale of 1 to 10.b
Intervention 16 8.00 (2)e 9 (2) −2.65 < 0.01d
Control 15 7.00 (4)e 9.00 (3) −1.79 0.07
In general, how would you say your health is in the last 30 days?c
Intervention 16 2.50 (1) 3.00 (1) −2.13 0.03d
Control 15 2.00 (0) 2.00 (2) −0.83 0.41
  1. IQR Interquartile Range
  2. aLikert scale was used to obtain occurrence scores (1 = Never; 2 = Rarely; 3 = Sometimes; 4 = Often; 5 = Always)
  3. bLikert scale was used to obtain adherence scores (1 = Least Adherent; 10 = Most Adherent)
  4. cLikert scale was used to obtain health status quality scores (1 = Poor; 2 = Fair; 3 = Good; 4 = Very Good; 5 = Excellent)
  5. dSignificant differences at 95% confidence level
  6. eThe reported values at baseline are different than Table 2, Table 5 and Fig. 5 because the Wilcoxon Matched-Pairs Signed Rank Test only included recoded values at pre-post measurement and missing values are excluded