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Table 2 Sex, age group, and vaccine type for reported SARS-CoV-2 infections among vaccinated persons compared to the vaccinated population for five U.S. states during January–March 2021

From: Evaluating risk factors associated with COVID-19 infections among vaccinated people early in the U.S. vaccination campaign: an observational study of five states, January–March 2021

 

Vaccine breakthrough cases

Total

vaccinated

Person-weeks of vaccinated time at risk

Rate*

Unadjusted

incidence rate ratio

Adjusted

incidence rate ratio**

 

No

No

  

IRR

(95% CI)

aIRR

(95% CI)

Sex

       

 Male

524

794,033

4,243,156

12.3

Ref

 

Ref

 

 Female

1,053

1,286,750

7,198,863

14.6

1.2

(1.0–1.4)

1.1

(1.0–1.3)

Age group

       

 < 65 years

965

1,001,871

6,387,727

15.1

Ref

 

Ref

 

 65–84 years

461

908,446

4,236,965

10.9

0.7

(0.6–0.8)

0.9

(0.8–1.1)

 ≥ 85 years

156

179,215

869,710

17.9

1.2

(0.9–1.5)

1.6

(1.3–2.0)

Vaccine type

       

 Moderna

502

951,087

4,805,959

10.4

Ref

 

Ref

 

 Pfizer

1,073

1,136,729

6,678,125

16.1

1.5

(1.3–1.8)

1.4

(1.2–1.6)

  1. IRR: incidence rate ratio; aIRR: adjusted incidence rate ratio; CI: confidence intervals. Unknown values in numerator and denominator excluded from analyses
  2. *Per 100,000 person-weeks
  3. **Adjusted model included sex, age group, vaccine type, state, and month of vaccine series completion