Data analysis
We conducted a descriptive analysis using frequencies and percentages for each variable. We also calculated the percentage of agreement (strongly agree/agree responses) with acceptability and appropriateness statements: number of answers strongly agree/agree out of the total of women who responded. For multiple-choice questions (e.g., variable "understanding of the message"), the percentage of each option was calculated as follows: number of times an option was chosen out of the total mentioned options. All percentages of agreement with acceptability, appropriateness and comprehension statements were calculated among women who remember received SMS messages.We compared acceptability, appropriateness, comprehension, and perception of SMS messages as a cue to action by triage adherence. Association between variables was determined using Chi-squared tests. Significance was assumed at a two-sided value of p < 0.05. We used R statistical software (version 3.5.0) for all analysis.