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Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 1 Patients with an exacerbation of asthma.
Figuras y tablas -
Analysis 1.1

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 1 Patients with an exacerbation of asthma.

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 2 Patients with a fall in PEF of over 30%.
Figuras y tablas -
Analysis 1.2

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 2 Patients with a fall in PEF of over 30%.

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 3 Fall in mean Peak Flow (% baseline) days 2‐4.
Figuras y tablas -
Analysis 1.3

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 3 Fall in mean Peak Flow (% baseline) days 2‐4.

Study

Kut 1999

No significant change in PC20 following either placebo or vaccine.
PC20 (SD) in the placebo group was 7.02 (9.3) before challenge and 7.3 (3.6) after 24 hours. In the vaccine group PC20 was 9.5(10.6) before vaccine and 9.8(9.3) afterwards. (P>0.05)

Reid 1998

No significant difference found in placebo group (n=5) or vaccination group (n=17) in either mean PD20 or mean FEV1 (tested by analysis of variance ANOVA). No individual patient in either group showed a change of PD20 of more than two‐fold.

Sener 1999

No significant difference between placebo and vaccine in PD20 at 2 weeks. Vaccine 2.96(SD 3.2) and placebo 2.76 (SD 2.91)

Figuras y tablas -
Analysis 1.4

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 4 Change in airways responsiveness.

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 5 Increased nebuliser usage (days 1‐3).
Figuras y tablas -
Analysis 1.5

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 5 Increased nebuliser usage (days 1‐3).

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 6 Increased use of bronchodilators following vaccination (days 1‐3).
Figuras y tablas -
Analysis 1.6

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 6 Increased use of bronchodilators following vaccination (days 1‐3).

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 7 Hospital admission (0‐14 days post‐immunisation).
Figuras y tablas -
Analysis 1.7

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 7 Hospital admission (0‐14 days post‐immunisation).

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 8 Medical consultation (0‐14 days after immunisation).
Figuras y tablas -
Analysis 1.8

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 8 Medical consultation (0‐14 days after immunisation).

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 9 New or increased oral steroid use (0‐14 days after immunisation).
Figuras y tablas -
Analysis 1.9

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 9 New or increased oral steroid use (0‐14 days after immunisation).

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 10 One or more day off school or work.
Figuras y tablas -
Analysis 1.10

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 10 One or more day off school or work.

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 11 Number of symptom free days in fortnight after vaccination.
Figuras y tablas -
Analysis 1.11

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 11 Number of symptom free days in fortnight after vaccination.

Study

Govaert 1992

No adverse reactions on asthma symptoms reported from any of the 14 asthmatics immunised with split‐virus vaccine or the 11 astmatics given placebo. (Communication from author)

Hahn 1980

No significant deterioration in home Peak Flow measurement in the split vaccine (25 patients), subunit vaccine (25 patients) or placebo group (16 patients) in the two weeks following vaccination. No numerical data given.

Sener 1999

No significant difference in symptom scores in the week after vaccine. Placebo mean score 4.66 (SD 7.3), vaccine mean score 4.92 (SD 7.56)

Stenius 1986

Similar in the vaccine and placebo groups. No numerical data provided.

Figuras y tablas -
Analysis 1.12

Comparison 1 Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes), Outcome 12 Change in asthma symptoms in the week following vaccination..

Comparison 2 Split virus or Surface Antigen vaccine v. Placebo (Late Outcomes), Outcome 1 Influenza related asthma exacerbations.
Figuras y tablas -
Analysis 2.1

Comparison 2 Split virus or Surface Antigen vaccine v. Placebo (Late Outcomes), Outcome 1 Influenza related asthma exacerbations.

Comparison 2 Split virus or Surface Antigen vaccine v. Placebo (Late Outcomes), Outcome 2 Duration of influenza related asthma exacerbation (days).
Figuras y tablas -
Analysis 2.2

Comparison 2 Split virus or Surface Antigen vaccine v. Placebo (Late Outcomes), Outcome 2 Duration of influenza related asthma exacerbation (days).

Comparison 2 Split virus or Surface Antigen vaccine v. Placebo (Late Outcomes), Outcome 3 Severity of influenza related asthma exacerbation (symptom score).
Figuras y tablas -
Analysis 2.3

Comparison 2 Split virus or Surface Antigen vaccine v. Placebo (Late Outcomes), Outcome 3 Severity of influenza related asthma exacerbation (symptom score).

Comparison 3 Live Attenuated Cold Recombinant vaccine v. Placebo (Early Outcomes), Outcome 1 Hospital admission for asthma exacerbation.
Figuras y tablas -
Analysis 3.1

Comparison 3 Live Attenuated Cold Recombinant vaccine v. Placebo (Early Outcomes), Outcome 1 Hospital admission for asthma exacerbation.

Comparison 3 Live Attenuated Cold Recombinant vaccine v. Placebo (Early Outcomes), Outcome 2 Asthma exacerbations in the month after vaccination.
Figuras y tablas -
Analysis 3.2

Comparison 3 Live Attenuated Cold Recombinant vaccine v. Placebo (Early Outcomes), Outcome 2 Asthma exacerbations in the month after vaccination.

Study

Miyazaki 1993

No asthma attacks were apparent following vaccination. Evaluation was made difficult by an Adenovirus outbreak during the study period. No defintion of asthma attack provided by the authors.

Tanaka 1993

No asthma attacks were observed following vaccination (20 patients given CR vaccine and 25 given placebo). No defintion of asthma attack provided by the authors.

Figuras y tablas -
Analysis 3.3

Comparison 3 Live Attenuated Cold Recombinant vaccine v. Placebo (Early Outcomes), Outcome 3 Asthma exacerbations in the week following vaccination.

Comparison 3 Live Attenuated Cold Recombinant vaccine v. Placebo (Early Outcomes), Outcome 4 Mean FEV1 at 2‐5 days post vaccination (% predicted).
Figuras y tablas -
Analysis 3.4

Comparison 3 Live Attenuated Cold Recombinant vaccine v. Placebo (Early Outcomes), Outcome 4 Mean FEV1 at 2‐5 days post vaccination (% predicted).

Comparison 3 Live Attenuated Cold Recombinant vaccine v. Placebo (Early Outcomes), Outcome 5 Numer of patients with significant fall in FEV1 (over 12%‐15% or 50mls) on day 2‐4.
Figuras y tablas -
Analysis 3.5

Comparison 3 Live Attenuated Cold Recombinant vaccine v. Placebo (Early Outcomes), Outcome 5 Numer of patients with significant fall in FEV1 (over 12%‐15% or 50mls) on day 2‐4.

Comparison 3 Live Attenuated Cold Recombinant vaccine v. Placebo (Early Outcomes), Outcome 6 Fall in mean FEV1 in litres (day 2‐4).
Figuras y tablas -
Analysis 3.6

Comparison 3 Live Attenuated Cold Recombinant vaccine v. Placebo (Early Outcomes), Outcome 6 Fall in mean FEV1 in litres (day 2‐4).

Comparison 3 Live Attenuated Cold Recombinant vaccine v. Placebo (Early Outcomes), Outcome 7 Number of puffs of beta‐2 agonist per day (in month following vaccination).
Figuras y tablas -
Analysis 3.7

Comparison 3 Live Attenuated Cold Recombinant vaccine v. Placebo (Early Outcomes), Outcome 7 Number of puffs of beta‐2 agonist per day (in month following vaccination).

Comparison 3 Live Attenuated Cold Recombinant vaccine v. Placebo (Early Outcomes), Outcome 8 Morning Peak Flow of >30% below baseline at least once in the 4 weeks after vaccination.
Figuras y tablas -
Analysis 3.8

Comparison 3 Live Attenuated Cold Recombinant vaccine v. Placebo (Early Outcomes), Outcome 8 Morning Peak Flow of >30% below baseline at least once in the 4 weeks after vaccination.

Study

Ortwein 1987

No significant differences found in home Peak Flow measurements in the three days following vaccination in any of the vaccine groups individually or together. No numerical data provided in the paper.

Figuras y tablas -
Analysis 5.1

Comparison 5 Immunisation with Whole virus v. Split virus v. Subunit vaccine (Early outcomes), Outcome 1 Home Peak Flow measurements before and after vaccination.

Study

Ortwein 1987

No deterioration in Lung Function measured in the laboratory in the 3 days following immunisation (either no change or small improvements seen.) No numerical data provided.

Figuras y tablas -
Analysis 5.2

Comparison 5 Immunisation with Whole virus v. Split virus v. Subunit vaccine (Early outcomes), Outcome 2 Lung function measurements.

Comparison 1. Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes)

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1 Patients with an exacerbation of asthma Show forest plot

2

4412

Risk Difference (M‐H, Fixed, 95% CI)

‐0.00 [‐0.02, 0.02]

1.1 First‐time vaccinees

2

948

Risk Difference (M‐H, Fixed, 95% CI)

0.02 [‐0.03, 0.07]

1.2 Repeat vaccinees

2

3464

Risk Difference (M‐H, Fixed, 95% CI)

‐0.01 [‐0.03, 0.02]

2 Patients with a fall in PEF of over 30% Show forest plot

2

4252

Risk Difference (M‐H, Fixed, 95% CI)

0.00 [‐0.02, 0.03]

2.1 First‐time vaccinees

1

194

Risk Difference (M‐H, Fixed, 95% CI)

0.06 [0.01, 0.11]

2.2 Repeat vacinees

1

328

Risk Difference (M‐H, Fixed, 95% CI)

0.01 [‐0.01, 0.03]

2.3 Vaccination status unspecified

1

3730

Risk Difference (M‐H, Fixed, 95% CI)

0.00 [‐0.02, 0.02]

3 Fall in mean Peak Flow (% baseline) days 2‐4 Show forest plot

2

Mean Difference (IV, Fixed, 95% CI)

Subtotals only

4 Change in airways responsiveness Show forest plot

Other data

No numeric data

5 Increased nebuliser usage (days 1‐3) Show forest plot

1

Risk Difference (M‐H, Fixed, 95% CI)

Totals not selected

6 Increased use of bronchodilators following vaccination (days 1‐3) Show forest plot

3

4228

Risk Difference (M‐H, Fixed, 95% CI)

‐0.00 [‐0.02, 0.01]

7 Hospital admission (0‐14 days post‐immunisation) Show forest plot

1

Risk Difference (M‐H, Fixed, 95% CI)

Totals not selected

8 Medical consultation (0‐14 days after immunisation) Show forest plot

2

4396

Risk Difference (M‐H, Fixed, 95% CI)

0.00 [‐0.01, 0.02]

9 New or increased oral steroid use (0‐14 days after immunisation) Show forest plot

2

4419

Risk Difference (M‐H, Fixed, 95% CI)

0.00 [‐0.01, 0.01]

10 One or more day off school or work Show forest plot

1

Risk Difference (M‐H, Fixed, 95% CI)

Totals not selected

11 Number of symptom free days in fortnight after vaccination Show forest plot

1

Mean Difference (IV, Fixed, 95% CI)

Totals not selected

12 Change in asthma symptoms in the week following vaccination. Show forest plot

Other data

No numeric data

Figuras y tablas -
Comparison 1. Split virus or Surface Antigen vaccine v. Placebo (Early Outcomes)
Comparison 2. Split virus or Surface Antigen vaccine v. Placebo (Late Outcomes)

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1 Influenza related asthma exacerbations Show forest plot

1

Risk Difference (M‐H, Fixed, 95% CI)

Subtotals only

1.1 Number of participants with influenza related exacerbations

1

696

Risk Difference (M‐H, Fixed, 95% CI)

0.01 [‐0.02, 0.04]

1.2 Number of patients with any asthma exacerbation

1

696

Risk Difference (M‐H, Fixed, 95% CI)

‐0.04 [‐0.09, 0.00]

2 Duration of influenza related asthma exacerbation (days) Show forest plot

1

Mean Difference (IV, Fixed, 95% CI)

Totals not selected

3 Severity of influenza related asthma exacerbation (symptom score) Show forest plot

1

Mean Difference (IV, Fixed, 95% CI)

Totals not selected

Figuras y tablas -
Comparison 2. Split virus or Surface Antigen vaccine v. Placebo (Late Outcomes)
Comparison 3. Live Attenuated Cold Recombinant vaccine v. Placebo (Early Outcomes)

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1 Hospital admission for asthma exacerbation Show forest plot

1

Risk Difference (M‐H, Fixed, 95% CI)

Totals not selected

2 Asthma exacerbations in the month after vaccination Show forest plot

1

Risk Difference (M‐H, Fixed, 95% CI)

Totals not selected

3 Asthma exacerbations in the week following vaccination Show forest plot

Other data

No numeric data

4 Mean FEV1 at 2‐5 days post vaccination (% predicted) Show forest plot

1

Mean Difference (IV, Fixed, 95% CI)

Totals not selected

5 Numer of patients with significant fall in FEV1 (over 12%‐15% or 50mls) on day 2‐4 Show forest plot

2

65

Risk Difference (M‐H, Fixed, 95% CI)

0.01 [‐0.12, 0.15]

6 Fall in mean FEV1 in litres (day 2‐4) Show forest plot

1

Mean Difference (IV, Fixed, 95% CI)

Totals not selected

7 Number of puffs of beta‐2 agonist per day (in month following vaccination) Show forest plot

1

Mean Difference (IV, Fixed, 95% CI)

Totals not selected

8 Morning Peak Flow of >30% below baseline at least once in the 4 weeks after vaccination Show forest plot

1

Risk Difference (M‐H, Fixed, 95% CI)

Totals not selected

Figuras y tablas -
Comparison 3. Live Attenuated Cold Recombinant vaccine v. Placebo (Early Outcomes)
Comparison 4. Live Attenuated Cold Recombinant vaccine v. Placebo (Late Outcomes)

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1 All outcomes

Other data

No numeric data

Figuras y tablas -
Comparison 4. Live Attenuated Cold Recombinant vaccine v. Placebo (Late Outcomes)
Comparison 5. Immunisation with Whole virus v. Split virus v. Subunit vaccine (Early outcomes)

Outcome or subgroup title

No. of studies

No. of participants

Statistical method

Effect size

1 Home Peak Flow measurements before and after vaccination Show forest plot

Other data

No numeric data

2 Lung function measurements Show forest plot

Other data

No numeric data

Figuras y tablas -
Comparison 5. Immunisation with Whole virus v. Split virus v. Subunit vaccine (Early outcomes)