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Table 3 Comparison of the use of the intervention between groups

From: Effectiveness and adherence to closed face shields in the prevention of COVID-19 transmission: a non-inferiority randomized controlled trial in a middle-income setting (COVPROSHIELD)

 

Total (N= 275), median, IQR

Face shield + surgical face mask group (N= 135), median, IQR

Surgical face mask group (N= 140), median, IQR

p-value

Mobility

 Number of working days during the follow-up period

12 (9–15)

12 (8–15)

13 (9–15)

0.46ª

PPE adherence

 Average number of days of use of assigned PPE

15 (12–17)

14 (11–17)

15 (13–18)

< 0.001ª

 Average number of hours of use of the assigned PPE per day

6 (4.3–8)

5 (4–6.7)

7.3 (5.3–8.7)

< 0.001ª

 Average number of hours of use of face mask only per day

6 (4–8)

5.5 (4–8)

7.3 (5.3–8.7)

< 0.001ª

 

n(%)

n(%)

n(%)

 

Adherence use of the intervention

   

< 0.001b

 High

161 (58.5)

37 (27.4)

124 (88.6)

 

 Medium-high

78 (28.4)

63 (46.7)

15 (10.7)

 

 Medium

7 (2.5)

7 (5.2)

0 (0)

 

 Medium-low

21 (7.6)

20 (14.8)

1 (0.7)

 

 Low

8 (2.9)

8 (5.9)

0 (0)

 
  1. Medians and % were calculated based on the participants who provided complete information during the three follow-up calls. Six participants (4.2%) are missing values among the intervention group, and two (1.4%) are missing values among the active control group
  2. IQR interquartile range, PPE personal protective equipment
  3. ap-value calculated with the Mann–Whitney U non-parametric test
  4. bp-value calculated with the Fisher's exact test