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Table 2 Results from survey/self-assessment and serological and PCR screening

From: High class filtering facepiece (FFP) are fundamental and effective in protection of emergency health care workers: an observational cohort study in a German community

Parameter

All

EMS

HS

NPC

p value

Study participants (n)

730

325

322

83

N/A

Risk exposure

Q1: Known contact to SARS-CoV-2 positive patient or suspected SARS-CoV-2 patient, n (%)

473 (65)

276 (85)

197 (61)

N/A

0.01#

Q2: Unknown contact to SARS-CoV-2 positive patient, n (%)

275 (38)

178 (55)

96 (30)

N/A

0.01#

Q3: In terms of unknown contact: PPE used was a surgical mask or unprotected, n (%)

74 (27)

15 (8)

58 (60)

N/A

< 0.01#

Awareness of symptoms and COVID-19

Q4: Flu symptoms within last 10 months, n (%)

360 (50)

154 (47)

169 (52)

37 (44)

0.31##

Q5: Self assessment: Do you think you have been infected with SARS-CoV-2 or COVID-19, n (%)

83 (16)

61 (19)

34 (10)

8 (10)

0.02##

Seroprevalence SARS-CoV-2 ab or PCR§

Sero + and PCR + , n

6

2

3

1

ND

Sero + but PCR − , n

3

1

1

1

ND

PCR + but Sero − , n

4

1

3

0

ND

n positive/ n paticipants

13/730

4/325

7/322

2/83

ND

SARS-CoV-2 incidence

Incidence, %

1.8

1.2

2.2

2.4

0.58##

  1. Q question, EMS emergency medical service, HS hospital staff, NPC non-patient contact group, PPE personal protective equipment, + positive and – negative, N/A not applicable, ND not determined
  2. §Positive PCR test result provided by study participants and within the observational period (March until December 2020)
  3. #Student t test comparing EMS with HS
  4. ##ANOVA Kruskal–Wallis test for trend in all groups