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Table 1 Characteristics of cases and controls

From: COVID-19 vaccines effectiveness against symptomatic SARS-CoV-2 during Delta variant surge: a preliminary assessment from a case-control study in St. Petersburg, Russia

  

Cases (%)

Controls (%)

  

1,254

2,747

Age (mean (SD))

 

49.82 (16.14)

45.68 (15.06)

Age (categories (%))

   
 

18-30

144 (11.5)

419 (15.3)

 

31-40

275 (21.9)

808 (29.4)

 

41-50

240 (19.1)

499 (18.2)

 

51-60

245 (19.5)

496 (18.1)

 

60+

350 (27.9)

525 (19.1)

Sex (%)

   
 

Female

791 (63.1)

1,475 (53.7)

 

Male

463 (36.9)

1,272 (46.3)

Vaccine name (%)

   
 

Gam-COVID-Vac (Sputnik V)

288 (23.0)

937 (34.1)

 

Gam-COVID-Vac (Sputnik Light)

57 (4.5)

214 (7.8)

 

EpiVacCorona

19 (1.5)

15 (0.5)

 

CoviVac

37 (3.0)

88 (3.2)

 

Other

23 (1.8)

29 (1.1)

 

No vaccine

830 (66.2)

1,464 (53.3)

Vaccination status

   
 

Non-vaccinated

830 (66.2)

1,488 (54.2)

 

Partial vaccination

20 (1.6)

46 (1.7)

 

Complete vaccination

404 (32.2)

1,213 (44.2)

Reinfection

   
 

History of confirmed COVID-19

2 (0.2)

606 (22.1)

 

No history of confirmed COVID-19

1,252 (99.8)

2,141 (77.9)

Recruitment dates

   
 

October 6

177 (14.1)

329 (12.0)

 

October 7

126 (10.0)

246 (9.0)

 

October 8

133 (10.6)

306 (11.1)

 

October 9

134 (10.7)

275 (10.0)

 

October 10

111 (8.9)

227 (8.3)

 

October 11

145 (11.6)

392 (14.3)

 

October 12

134 (10.7)

487 (17.7)

 

October 13

169 (13.5)

234 (8.5)

 

October 14

125 (10.0)

251 (9.1)