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TABLE 2

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 Overall Population for the Second Dose of Influenza Vaccine (Appointment Versus Walk-in) and Child Insurance Type (Commercial Versus Public and Uninsured)

(A) End PointArm (N)% Received second Dose (N)Adjusted (Stratified) Difference % (95% CI)
End of season Intervention (1044) 83.8 (875) 3.8 (0.1–7.5) 
Usual care (1042) 80.9 (843) 
Day 42 post first dose Intervention (1044) 62.4 (651) 8.3 (3.6–13.0) 
Usual care (1042) 55.7 (580) 
(A) End PointArm (N)% Received second Dose (N)Adjusted (Stratified) Difference % (95% CI)
End of season Intervention (1044) 83.8 (875) 3.8 (0.1–7.5) 
Usual care (1042) 80.9 (843) 
Day 42 post first dose Intervention (1044) 62.4 (651) 8.3 (3.6–13.0) 
Usual care (1042) 55.7 (580) 

All estimates stratified by practice site and by language in keeping with the stratification of randomization. Stratified differences estimated by the method of Bohning. Stratified differences will not equal differences of unstratified percentages.

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