In recent years, primary care has adopted SMS text messaging systems for patient communication, yet their efficacy in achieving positive outcomes remains unknown. For general practitioner (GP) practices, the National Health Service (NHS) sets annual targets that determine their funding. Since 2019, in addition to clinical outcomes, there has been a shift toward enhancing accessibility and appointment availability [1].

The widespread use of mobile phones in daily lives across all age groups [2] has facilitated the development of cost-effective, bulk text messaging systems for businesses [3]. Text messages are universally compatible and accessible across various network speeds, and do not require upgrades [4]. While bulk text messaging has been widely explored in business, its applications and potential impact within health care remain underexplored, which is the focus of this study.

Numerous scholarly articles have delved into the perspectives of patients about text message reminders [5-7]. Sherman et al [8] found that while text messages were deemed useful, patients wanted the option to reply to the messages. Maslakpak and Safaie [9] compared treatment compliance between groups receiving text messages, reminder cards, or no reminders; they found no significant difference between reminder cards and text messages.

Hirst et al [10] reported that patients received a postal reminder with or without a text reminder (generated by the iPlato texting system [11] integrated with EMIS Web [12]). They reported a slight improvement in screening uptake from 39.9% to 40.5%, but the difference was not statistically significant.

In a study involving 18,138 participants, Fisher et al [13] evaluated the effectiveness and utility of text messages in health care, noting that text messages increased appointment attendance and patient satisfaction. However, nonrandom sampling may compromise validity. Since participants volunteered, their willingness to engage might influence appointment attendance, potentially introducing bias to the results.

Research on GPs using text messaging systems primarily investigates patient preferences for receiving texts and doctors’ willingness to send them [14]. The literature predominantly discusses the advantages and disadvantages of such systems from the GP standpoint, rather than assessing their impact on patient appointment attendance. Trials evaluating text reminder systems have yielded mixed results, with no significant overall improvement in attendance rates [5,6]. Even trials with substantial cohorts exhibited only a modest 0.6% attendance increase, suggesting limited benefits of using text reminders [13].

This study adds to the expanding knowledge base in the field and offers insights into implementing effective appointment management strategies in primary care.

This study aimed to analyze missed appointment frequencies and demographic characteristics of patients who missed appointments. Of the 572,794 appointments booked, 9191 were missed, with 5286 (57.5%) attributed to women and 3905 (42.5%) to men (Table 1).

Mann-Whitney test results (Table 2) indicated higher rates of missed appointments before text messaging was implemented compared to after implementation, suggesting that text messaging can be an effective strategy for reducing missed appointments, particularly among women.

To assess the data more accurately, missed appointment rates were calculated for each age group (Figure 1). Significant differences in median missed appointment numbers across different age groups were observed (Table 3). The 20-25 years age group had the highest median number of missed appointments, whereas the 65-80 years age group had the lowest. Further information and statistical data are available in Multimedia Appendix 1.

Data analysis showed that text message reminders reduced missed appointments at the GP practice. Missed appointment frequency decreased before text messaging was introduced in September 2015 (Figure 2). Then, shortly after text messaging implementation, it increased, followed by a further decline to the lowest level noted in 10 years. Several factors may have contributed to this trend, including increased attention and improved data recording practices. Despite this factor, texting resulted in a statistically significant decrease in nonattendance at appointments (Table 1). These findings demonstrate the effectiveness of text messaging in reducing missed appointments.

This study explores the impact of SMS text messaging systems on reducing missed appointments in primary care, focusing on a single GP practice. While a significant 42.8% decrease in missed appointments was noted after implementation of text messaging reminders, caution is warranted in generalizing these results to broader health care settings. This 42.8% reduction is significant when compared with the findings of Maslakpak and Safaie [9] who found no significant difference.

Age group analysis revealed interesting findings regarding missed appointments. Surprisingly, the 20-25 age group emerged as significant overall, with a higher percentage of missed appointments, contrary to expectations given their high mobile phone use. De-Sola et al [18] observed increased phone use for the 16-25 years age group. However, despite prolific phone usage, the 20-25 years age group patients did not exhibit reduced missed appointments. These findings highlight the positive impact of text reminder systems on missed appointments overall, yet further exploration is needed to understand factors influencing attendance in specific demographics.

In conclusion, text messaging reminders can effectively reduce missed appointments, enabling more GP consultations. However, it is unlikely that missed appointments can be completely avoided. Health care technology offers opportunities for further improvement, including timely text reminders and systematic patient data maintenance. By embracing technology in health care, we can overcome challenges, maximize appointment availability, and enhance patient care.