Background
Alaska Native and American Indian people (AN/AIs) have high incidence of colorectal cancer (CRC) and CRC-related mortality. Screening can prevent death from CRC, but screening rates are low in racially and ethnically diverse populations. We conducted a randomized controlled trial using text messaging to increase CRC screening among unscreened AN/AIs in a tribal healthcare system in Anchorage, Alaska.
Methods
The intervention entailed up to three text messages one month apart. We randomized 2,386 AN/AIs aged 40–75 years old who were eligible for CRC screening to the intervention or usual-care control conditions. Screening status was ascertained from electronic health records three and six months after the last message. We estimated hazard ratios (HR) to evaluate the intervention’s effectiveness, stratified by age and sex.
Results
The intervention increased CRC screening for people ages 50–75 (HR = 1.42, 95% CI = 0.97–2.09) and ages 40–49 (HR = 1.24, 95% CI = 0.95–1.62). Within both age groups the HRs were higher for women (HR = 1.69, 95% CI = 1.02–2.80; and HR = 1.37, 95% CI = 1.01–1.88) than for men (HR = 1.09, 95% CI = 0.59–1.99; and HR = 0.90, 95% CI = 0.54–1.53). Interaction analysis yielded p values of 0.55 and 0.09 for age and sex, respectively.
Conclusions
A simple text messaging intervention increased CRC screening in AN/AIs, a group with high CRC morbidity and mortality. Text messaging may be a cost-effective means of reducing CRC screening disparities in AN/AIs and other populations.