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Table 2 Comparison of the primary outcome between the 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)

 

Face shield + surgical face mask group, N (%)

Surgical face mask group, N (%)

Absolute risk difference

p-valuea

Intention-to-treat analysis

(N= 141)

(N= 142)

% [95% CI]

 

 Primary composite outcome

1 (0.7)

3 (2.1)

− 1.40 [− 4.14, 1.33]

0.31

 Positive RT-PCR test

1 (0.7)

1 (0.7)

0.005 [− 1.94, 1.96]

0.74

 Positive antibody test

  IgG

0 (0)

2 (1.4)

− 1.40 [− 3.3, 0.53]

0.25

  IgM

0 (0)

0 (0)

Per protocol analysis

(N= 135)

(N= 140)

% [95% CI]

 

 Primary composite outcome

1 (0.7)

3 (2.7)

− 1.40 [− 4.20, 1.40]

0.32

 Positive RT-PCR test

1 (0.7)

1 (0.7)

0.02 [− 1.98, 2.02]

0.74

 Positive antibody test

  IgG

0 (0)

2 (1.4)

− 1.40 [− 0.39, 5.37]

0.25

  IgM

0 (0)

0 (0)

  1. RT-PCR reverse-transcriptase polymerase chain reaction
  2. ap-value calculated with the Fisher's exact test