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Table 3 Adjusted odds ratio for regression model coefficients for the first and second booster uptake

From: Factors underlying COVID-19 booster vaccine uptake among adults in Belgium

Variable

Level

aOR [95% CI]

First booster

Second booster

Sex

Female

Ref

Ref

Male

0.93 [0.88; 0.98]

1.07 [1.04; 1.11]

Age group

18–24

Ref

NA

25–34

1.13 [1.04; 1.23]

NA

35–44

1.41 [1.29; 1.54]

NA

45–54a or 50–54b

2.09 [1.91; 2.29]

Ref

55–64

3.31 [3.00; 3.64]

1.71 [1.63; 1.79]

65–74

5.56 [4.94; 6.27]

3.56 [3.39; 3.75]

75–84

5.69 [4.91; 6.59]

4.91 [4.61; 5.23]

85 + 

5.23 [4.24; 6.45]

5.63 [5.14; 6.16]

Region of residence

Flanders

Ref

Ref

Brussels

0.23 [0.21; 0.25]

0.29 [0.27; 0.31]

Wallonia

0.41 [0.39; 0.44]

0.31 [0.30; 0.32]

Infection history

COVID-naïve

Ref

Ref

At least 1 infect. before

0.69 [0.63; 0.75]c

0.87 [0.82; 0.92]d

1 infect. after

0.33 [0.31; 0.36]c

1.09 [1.03; 1.15]d

> 1 infect. after

0.11 [0.03; 0.37]c

0.46 [0.30; 0.71]d

> 1 infect. before & after

0.17 [0.13; 0.21]c

0.82 [0.69; 0.98]d

  1. NA not applicable, Ref. level used as reference, infect. laboratory-confirmed COVID-19 infection
  2. aFor analysis first booster uptake (population ≥ 18 years)
  3. bFor analysis second booster uptake (population ≥ 50 years)
  4. cInfection history relative to PC
  5. dInfection history relative to first booster
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BMC Research Notes

ISSN: 1756-0500

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