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Table 3 Usability of the saliva and nasal Ag-RDTs

From: Head-to-head comparison of the accuracy of saliva and nasal rapid antigen SARS-CoV-2 self-testing: cross-sectional study

N = 2950

Saliva Ag-RDT

Nasal Ag-RDT

Difficulty taking a samplea

 Very easy

1286 (43.6)

726 (24.6)

 Easy

1087 (36.8)

1245 (42.2)

 Medium

380 (12.9)

613 (20.8)

 Hard

117 (4.0)

265 (9.0)

 Very hard

16 (0.5)

35 (1.2)

 Unknown

64 (2.2)

66 (2.2)

Difficulty reading the test resulta

 Very easy

1997 (67.7)

1940 (65.8)

 Easy

724 (24.5)

785 (26.6)

 Medium

110 (3.7)

128 (4.3)

 Hard

39 (1.3)

23 (0.8)

 Very hard

15 (0.5)

9 (0.3)

 Unknown

65 (2.2)

65 (2.2)

The user manual was clear

 Agree

2533 (85.9)

n/a

 In doubt

266 (9.0)

n/a

 Disagree

86 (2.9)

n/a

 Unknown

65 (2.2)

n/a

The test went well

 Agree

2514 (85.2)

n/a

 In doubt

322 (10.9)

n/a

 Disagree

50 (1.7)

n/a

 Unknown

65 (2.2)

n/a

If I could, I would use the test at home

 Agree

2554 (86.6)

n/a

 In doubt

89 (3.0)

n/a

 Disagree

239 (8.1)

n/a

 Unknown

68 (2.3)

n/a

Do you prefer one test over the other

 No

969 (32.8)

 Yes, saliva Ag-RDT preferred

1639 (55.6)

 Yes, nasal Ag-RDT preferred

275 (9.3)

 Unknown

67 (2.3)

  1. n/a not available
  2. ap-value < 0.0001 for an omnibus symmetry test result for a paired contingency table (McNemar-Bowker test). The unknown category was not included in this test