Table 1 Immunization rate and vaccine effectiveness

Elementary school

IR

(%)

54.7

51.2

46.7

48.8

46.0

43.8

40.9

34.9

39.3

43.4

VE

(%)

10.1

10.4

5.5

26.4

3.7

15.8

16.7

26.6

21.8

– 5.6

n =

9803

9622

9899

10,225

9706

9630

10,449

10,763

10,781

10,190

P < 0.001

P < 0.01

P = 0.061

P < 0.001

P = 0.235

P < 0.001

P < 0.001

P < 0.001

P < 0.001

P = 0.044

Middle school

IR

(%)

49.4

50.6

42.3

41.3

37.8

37.4

37.4

32.8

34.6

34.8

VE

(%)

– 18.5

– 15.9

–18.5

– 32.4

– 45.6

– 3.6

– 11.7

– 8.7

– 27.9

– 29.6

n =

4633

4315

4204

4605

4296

3763

5144

4653

4749

4111

P < 0..001

P < 0.01

P <  0.01

P < 0.001

P < 0.001

P = 0.494

P = 0.025

P = 0.055

P < 0.001

P < 0.001

School staff

IR

(%)

37.4

37.2

31.3

3.7

35.8

35.9

35.2

33.1

38.2

42.2

VE

(%)

– 37.8

22.2

39.4

–9.2

– 27.0

– 7.2

11.9

– 2.3

2.9

– 6.4

n =

1211

937

996

1112

881

925

1153

1065

1042

1027

P = 0 .108

P = 0.286

P < 0.01

P = 0.692

P = 0.212

P = 0.705

P = 0.455

P = 0.888

P = 0.888

P < 0.01