Table 2 BNT162b2 vaccine effectiveness against COVID-19 related hospitalization among children 6–11 years old.

From: Effectiveness of COVID-19 vaccines among children 6–11 years against hospitalization during Omicron predominance in Malaysia

 

Population

COVID-19 hospitalizations

Follow up time in days (median, IQR)

Person-days

COVID-19 hospitalization incidence rate (per 1,000,000 person-days)

Univariate

Overall

HR

95% CI

HR

95% CI

p-value

Vaccination status*

 Unvaccinated

1,238,040

414

242 (242–242)

431,984,362

9.6

Ref

Ref

Ref

Ref

Ref

 Partially vaccinated

136,570

45

129 (102–137)

47,652,852

9.4

0.74

0.55, 1.00

0.73

0.53, 1.01

0.06

 Completed primary series with BNT162b2 mRNA (Cominarty-Pfizer/BioNTech)

1,099,554

229

127 (78.2–235)

383,697,568

6

0.66

0.54, 0.76

0.62

0.52, 0.73

 < 0.01

Recent infection*a

 None

2,372,722

668

242 (131–242)

827,935,555

8.1

Ref

Ref

Ref

Ref

Ref

 Recent infection within 6 months

101,442

20

132 (76.2–272)

35,399,227

5.6

0.69

0.44, 1.07

0.88

0.51, 1.23

0.61

  1. HR hazard ratio, CI confidence interval, Ref reference category, IQR interquartile range.
  2. aRecent infectionis defined as any infection within 6 months prior to the study period. A reinfection is defined as an infection after a period of 90 or more days since the previous infection.
  3. *Models were adjusted for age, sex, recent infection within 6 months and stratified by region.
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