Table 3 Chi-squared analysis of groups <10th percentile and >90th percentile.

From: The antibody response to SARS-CoV-2 infection persists over at least 8 months in symptomatic patients

  

<10 perc

>90 perc

p value

Sex

F

321

340

0.0627

M

133

105

Age

21–30

93

83

0.5429

31–40

108

94

0.3804

41–50

121

142

0.0970

51–60

88

98

0.3711

60+

44

28

0.0793

BMIa

18.5≤ BMI < 25

267

255

0.6963

BMI ≥ 30

58

72

0.1750

25≤ BMI < 30

106

93

0.4214

BMI < 18.5

23

25

0.8261

Role

Otherb

63

37

0.0109

Anesthesiologist

6

7

0.9701

Biologist

5

2

0.4640

Surgeon

25

21

0.7007

Physiotherapist

6

7

0.9710

Nurse

113

132

0.1255

Physician

56

61

0.6082

Healthcare Partner Operator

38

64

0.0062

Front office (PARC)

31

28

0.8494

Researcher

13

9

0.5485

Cleaning service

7

9

0.7698

Transport Service

5

5

0.7747c

Staff

69

44

0.0214

Student

5

4

0.9759c

Laboratory Technician

6

7

0.9701

Radiology Technician

6

8

0.7587

Site

Otherb

6

3

0.5223c

Casa di Cura Cellini

19

8

0.0573

Clinica Fornaca di Sessant

18

12

0.3828

Humanitas Castelli

23

47

0.0032

Humanitas Gavazzeni

97

142

0.0005

Humanitas Gradenigo

36

22

0.0918

Humanitas Mater Domini

20

23

0.7041

Humanitas Medical Care

8

3

0.2379c

Humanitas Rozzano

190

160

0.0806

Humanitas San Pio X

27

21

0.5025

Humanitas University

10

4

0.1905c

  1. aSome subjects did not indicate their BMI.
  2. bRefers to volunteers and other professionals that operate in several structures.
  3. cMinority class is less or equal to 5 (chi-square test is not reliable).
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