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Table 2 Subject responses regarding the reminder SMS by study group (n = 344, France, 2007).

From: Use of short message service (SMS) to improve malaria chemoprophylaxis compliance after returning from a malaria endemic area

  SMS group Control group Total P value
n % n % n %
Usefulness of the device        
   Very useful 80 52.3 66 35.1 146 42.8 0,01
   Mostly useful 51 33.3 91 48.4 142 41.6  
   Somewhat useful 14 9.2 17 9.0 31 9.1  
   Not useful 8 5.2 14 7.5 22 6.5  
   Total 153 100.0 188 100.0 341 100.0  
Laboriousness of the device        
   Not annoying 96 62.8 86 46.0 182 53.5 <10-4
   Somewhat annoying 42 27.4 67 35.8 109 32.1  
   Mostly annoying 8 5.2 24 12.8 32 9.4  
   Very annoying 7 4.6 10 5.4 17 5.0  
   Total 153 100.0 187 100.0 340 100.0  
Usefulness of the generalizing the use of SMS reminders        
   Very useful 89 58.2 75 39.9 164 48.1 <10-4
   Mostly useful 45 29.4 81 43.1 126 37.0  
   Somewhat useful 15 9.8 27 14.4 42 12.3  
   Not useful 4 2.6 5 2.6 9 2.6  
   Total 153 100.0 188 100.0 341 100.0