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Table 2 Effectiveness of complete vaccination against referral to hospital, overall and according to age group, sex, and triage centre

From: Vaccine effectiveness against referral to hospital after SARS-CoV-2 infection in St. Petersburg, Russia, during the Delta variant surge: a test-negative case-control study

  

Referred to

Referred to

Crude VE

Adjusted VE

  

Outpatient follow-up*

Hospital*

(95% CI)

(95% CI)

Overall

 

1,274/12,124

17/478

66% (45–79)

81% (68–88)

Sex

Female

752/7,518

8/307

74% (47–87)

84% (66–92)

 

Male

522/4,606

9/171

54% (9–76)

76% (51–88)

Age

18–49

426/6,997

2/77

57% (-74–90)

63% (-51–91)

 

50 and older

848/5,127

15/401

77% (62–87)

82% (69–89)

Triage centre

1

456/4,967

7/225

66% (28–84)

79% (54–90)

 

2

818/7,157

10/253

65% (35–82)

82% (64–91)

  1. ∗Completely vaccinated/non-vaccinated and partially vaccinated