OBJECTIVE: To investigate whether short message service (SMS) reminders reduce nonattendance in physical therapy outpatient clinics. DESIGN: Prospective single-blinded randomized controlled trial. SETTING: Two physical therapy outpatient departments in metropolitan acute public hospitals. PARTICIPANTS: Participants with an appointment in a physical therapy outpatient clinic and who provided a contact mobile telephone number were included. Participants were excluded if their appointment was scheduled for the same day on which they made the appointment. INTERVENTION: Participants allocated to the intervention group received an SMS reminder before their next appointment; participants allocated to the control group did not receive a reminder. MAIN OUTCOME MEASURES: The primary outcome was rate of nonattendance without cancellation. Secondary outcomes were cancellation and attendance rates and exploration of other factors associated with nonattendance. RESULTS: Patients (n = 679) were allocated to receive either an SMS reminder (n = 342) or no reminder (n = 337). The nonattendance rate for patients who did not receive a reminder (16%) was more than nonattendance for patients receiving the SMS reminder (11%; odds ratio 1.61; 95% confidence interval (CI) 1.03 to 2.51; number needed to treat 19; 95% CI 9 to 275). There were no differences in cancellation or attendance rates between groups. Exploration of other factors found that patients who were younger with a neck and trunk musculoskeletal or a neuromuscular disorder and who were scheduled to have an initial appointment or an appointment on a Monday or Friday were significantly predictive of increased nonattendance. CONCLUSIONS: SMS reminders can reduce nonattendance in physical therapy outpatient clinics.

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