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TABLE 3

Effect Size of the Text Message Intervention on Receipt of Second Dose Influenza Vaccine by April 30 (Season End) and by Day 42 (2 Weeks After Second Dose Due) Post Vaccination, By Practices’ Typical Scheduling Approach for the Second Dose of Influenza Vaccine (Appointment Versus Walk-in) and Child Insurance Type (Commercial Versus Public and Uninsured)

(B) End PointPractices’ Scheduling Approach and Child Insurance % (N)ArmReceived Second Dose, %Difference % (95% Bootstrap CI)
End of season Appointment 75.5 (1574) Intervention 84.4 2.1 (−0.9 to 4.8) 
Usual care 82.3 
Walk-in 24.5 (512) Intervention 82.0 5.3 (0.5 to 9.4) 
Usual care 76.7 
Day 42 post first Dose Appointment 75.5 (1574) Intervention 64.5 5.1 (−0.2 to 10.0) 
Usual care 59.4 
Walk-in 24.5 (512) Intervention 55.7 11.3 (4.4 to 19.8) 
Usual care 44.4 
End of Season Commercial 54.5 (1137) Intervention 93.8 6.1 (3.2 to 9.0) 
Usual care 87.7 
Publicor uninsured 45.5 (948) Intervention 72.6 0.4 (−4.9 to 5.6) 
Usual care 72.1 
Day 42 post first dose Commercial 54.5 (1137) Intervention 75.0 8.8 (3.1 to 13.6) 
Usual care 66.2 
Public or uninsured 45.5 (948) Intervention 48.2 6.1 (−1.2 to 13.5) 
Usual care 42.1 
(B) End PointPractices’ Scheduling Approach and Child Insurance % (N)ArmReceived Second Dose, %Difference % (95% Bootstrap CI)
End of season Appointment 75.5 (1574) Intervention 84.4 2.1 (−0.9 to 4.8) 
Usual care 82.3 
Walk-in 24.5 (512) Intervention 82.0 5.3 (0.5 to 9.4) 
Usual care 76.7 
Day 42 post first Dose Appointment 75.5 (1574) Intervention 64.5 5.1 (−0.2 to 10.0) 
Usual care 59.4 
Walk-in 24.5 (512) Intervention 55.7 11.3 (4.4 to 19.8) 
Usual care 44.4 
End of Season Commercial 54.5 (1137) Intervention 93.8 6.1 (3.2 to 9.0) 
Usual care 87.7 
Publicor uninsured 45.5 (948) Intervention 72.6 0.4 (−4.9 to 5.6) 
Usual care 72.1 
Day 42 post first dose Commercial 54.5 (1137) Intervention 75.0 8.8 (3.1 to 13.6) 
Usual care 66.2 
Public or uninsured 45.5 (948) Intervention 48.2 6.1 (−1.2 to 13.5) 
Usual care 42.1 

Estimates for end of season, for which the follow up times differ across patients are based on a logistic regression, with confidence intervals estimated using 999 bootstrap samples (percentile method) in which resampling was done by practice site to reflect potential for clustering of patients within practice. Estimates of cumulative incidence at day 42 are based on survival curves using the method pseudo-values (Andersen et al), and confidence intervals are estimated using the same bootstrap sampling approach.

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