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Table 4 Measles vaccination effectiveness by age group during an outbreak in Kamwenge District, Uganda, April to August, 2015

From: Factors contributing to measles transmission during an outbreak in Kamwenge District, Western Uganda, April to August 2015

Age (y) and Vaccination status

Number

%

ORM-H (95% CI)

Vaccine Effectiveness (95% CI)

Cases

(n = 50)

Controls

(n = 200)

Cases

Control

All ages (9 m-52y)

 Vaccinated

25

127

61

77

0.36 (0.15–0.83)

64 (17–85)

 Not vaccinated

16

37

39

23

  

9 m-5y

 Vaccinated

16

91

52

75

0.30 (0.12–0.76)

70 (24–88)

 Not vaccinated

15

30

48

25

  

6-12y

 Vaccinated

4

18

80

75

0.33 (0.02–5.3)

67 (0–98)a

 Not vaccinated

1

6

20

25

  

13-52y

 Vaccinated

5

18

100

95

-b

-b

 Not vaccinated

0

1

0

5

  
  1. aThe upper bound of the 95% confidence interval for OR was >1, therefore the lower bound of the 95% confidence interval for Vaccine Effectiveness was set to 0
  2. bOR and Vaccine Effectiveness for persons aged ≥13y could not be calculated because all cases were vaccinated, resulting in a zero in the denominator