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Table 5 Donors’ 1-year re-donation intervals (in days) among the three groups (mean ± SD)

From: Effective methods for reactivating inactive blood donors: a stratified randomised controlled study

 Intervals for reactivated donors who were enrolledIntervals for reactivated donors who were successfully contacted
Telephone group1 to 365 (157.4 ± 102.8)1 to 365 (163.3 ± 95.8)
SMS group1 to 365 (141.5 ± 102.7)1 to 365 (155.5 ± 101.4)
Control group1 to 365 (151.7 ± 99.2)Not applicable