Table 1 Participants characteristics and associated proportion of possible COVID-19 by period

Age

0.003

0.002

 18–34

25.2 (1759)

13.8 (232)

8.3 (145)

5.5 (87)

 35–44

29.7 (3028)

14.8 (425)

8.3 (267)

6.6 (158)

 45–54

25.8 (2816)

12.6 (378)

8.7 (268)

3.9 (110

 55–64

19.3 (2498)

9.7 (269)

6.2 (193)

3.5 (76)

Sex

0.947

0.783

 Female

52.4 (5164)

13 (663)

8.2 (442)

4.8 (221)

 Male

47.6 (4937)

13 (641)

7.8 (431)

5.2 (210)

Nationality

0.437

0.709

 French

96.1 (9703)

13.1 (1263)

8.1 (842)

5.1 (421)

 Not french

3.9 (348)

11.3 (37)

7.3 (28)

4 (9)

Social Class

0.965

0.234

 Upper class

32.7 (5541)

13 (718)

8.8 (500)

4.3 (218)

 Upper middle class

20.9 (2397)

12.9 (303)

8.5 (205)

4.4 (98)

 Lower middle class

18.1 (894)

13.4 (114)

8 (72)

5.4 (42)

 Working class

21.8 (838)

12.4 (108)

6.9 (66)

5.5 (42)

 Health professional

6.5 (431)

13.9 (61)

6.2 (30)

7.7 (31)

Professional status

0.018

0.002

 Unemployed at the time of lockdown’s onset

24.5 (2178)

10.6 (241)

7.2 (177)

3.5 (64)

 Employed and stopped working since COVID

18.0 (1185)

15.7 (181)

10.3 (116)

5.4 (65)

 Full time teleworking

38.8 (5469)

12.9 (719)

8.1 (492)

4.7 (227)

 in-person professional activities

18.7 (1269)

13.7 (163)

6.6 (88)

7.1 (75)

Overcrowding

0.077

0.183

 less or equal than one pers./room

94.4 (9557)

12.8 (1210)

7.9 (816)

4.9 (394)

 more than one pers./room

5.6 (544)

16.3 (94)

9.5 (57)

6.7 (37)

Financial resources

0.046

0.077

 At ease

29.5 (4082)

12.8 (493)

8.3 (346)

4.5 (147)

 No particular problem

46.5 (4369)

12.1 (563)

7.5 (382)

4.5 (181)

 Difficult

24.1 (1581)

15.2 (238)

8.7 (138)

6.6 (100)

Region

0.02

0.006

 Ile-de-France

38.7 (5195)

14.4 (714)

8.9 (482)

5.5 (232)

 Grand Est

30.6 (2854)

13.4 (368)

9.1 (257)

4.3 (111)

 Hauts-de-France

30.7 (2052)

10.9 (222)

5.8 (134)

5.1 (88)

Agglomeration size

0.21

0.268

 Rural area

6.9 (488)

15.2 (67)

10.1 (47)

5.1 (20)

  < 50,000

4.3 (335)

12 (44)

7.3 (30)

4.7 (14)

 50–200,000

8.2 (536)

11.6 (67)

7.5 (49)

4.1 (18)

 200–500,000

17.1 (1972)

10.9 (229)

7.6 (157)

3.3 (72)

 500,000–1,000,000

24.8 (1564)

12.2 (180)

6.5 (106)

5.6 (74)

  > 1,000,000

38.8 (5200)

14.4 (715)

8.9 (482)

5.5 (233)

Chronic disease

<0.0001

<0.0001

 None

77.7 (7923)

12.9 (1001)

7.8 (664)

5 (337)

 Hypertension

4.7 (455)

10.2 (54)

4.7 (33)

5.5 (21)

 Asthma or other respiratory diseases

2.6 (246)

28.8 (61)

19.2 (44)

9.6 (17)

 Diabetes, cancer, heart disease, heart disease, immune diseases, liver, kidney, immunity,

2.4 (257)

12.6 (34)

10 (24)

2.6 (10)

 Others

12.7 (1220)

11.8 (154)

7.5 (108)

4.3 (46)

Active smoking

0.807

0.856

 Yes, daily

11.7 (819)

12.9 (93)

7.3 (57)

5.6 (36)

 Yes, sometimes (less than once a day)

4.6 (348)

11.3 (43)

6.2 (26)

5.1 (17)

 No

83.8 (8727)

13.1 (1136)

8.1 (770)

4.9 (366)

Obesity

0.811

0.448

 BMI < 30

85.9 (8889)

12.9 (1133)

7.8 (758)

5.1 (375)

 BMI ≥ 30

14.1 (868)

13.3 (124)

9.1 (84)

4.1 (40)

Individual preventive measures (mask, gel, social distancing) during outings in the last 7 days.

<0.0001

<0.0001

 All 3

27 (2797)

16.2 (413)

9.7 (277)

6.5 (136)

 At least one

63 (6355)

11.3 (750)

7 (497)

4.4 (253)

 None

10 (949)

14.7 (141)

10 (99)

4.6 (42)

All

100 (10,101)

13.0 (1304)

8.0 (873)

5.0 (431)