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Table 2 Rate of missed appointments (n = 6354)

From: Text-messaging versus telephone reminders to reduce missed appointments in an academic primary care clinic: a randomized controlled trial

  Total Text-message reminder Telephone reminder Relative effect size P value
n (%) n (%) n (%) OR (IC)
Division of primary care 697 (11.0) 376 (11.7) 321 (10.2) 0.9 (0.7-1.0) 0.07
 - General primary care clinic 468 (9.3) 256 (10.2) 212 (8.5) 0.8 (0.7-1.0) 0.04
 - Substance abuse clinic 229 (17.0) 120 (17.1) 109 (17.0) 1.0 (0.7-1.3) 0.98