title: Teenagers and texting: use of a youth ecological momentary assessment system in trajectory health research with latina adolescents.
abstract: BACKGROUND
  Adolescent females send and receive more text messages than any others, with an average of 4050 texts a month. Despite this technological inroad among adolescents, few researchers are utilizing text messaging technology to collect real time, contextualized data. Temporal variables (ie, mood) collected regularly over a period of time could yield useful insights, particularly for evaluating health intervention outcomes. Use of text messaging technology has multiple benefits, including capacity of researchers to immediately act in response to texted information.
  
  
  OBJECTIVE
  The objective of our study was to custom build a short messaging service (SMS) or text messaging assessment delivery system for use with adolescents. The Youth Ecological Momentary Assessment System (YEMAS) was developed to collect automated texted reports of daily activities, behaviors, and attitudes among adolescents, and to examine the feasibility of YEMAS. This system was created to collect and transfer real time data about individual- and social-level factors that influence physical, mental, emotional, and social well-being.
  
  
  METHODS
  YEMAS is a custom designed system that interfaces with a cloud-based communication system to automate scheduled delivery of survey questions via text messaging; we designed this university-based system to meet data security and management standards. This was a two-phase study that included development of YEMAS and a feasibility pilot with Latino adolescent females. Relative homogeneity of participants was desired for the feasibility pilot study; adolescent Latina youth were sought because they represent the largest and fastest growing ethnic minority group in the United States. Females were targeted because they demonstrate the highest rate of text messaging and were expected to be interested in participating. Phase I involved development of YEMAS and Phase II involved piloting of the system with Latina adolescents. Girls were eligible to participate if they were attending one of the participating high schools and self-identified as Latina. We contacted 96 adolescents; of these, 24 returned written parental consent forms, completed assent processes, and enrolled in the study.
  
  
  RESULTS
  YEMAS was collaboratively developed and implemented. Feasibility was established with Latina adolescents (N=24), who responded to four surveys daily for two two-week periods (four weeks total). Each survey had between 12 and 17 questions, with responses including yes/no, Likert scale, and open-ended options. Retention and compliance rates were high, with nearly 18,000 texts provided by the girls over the course of the pilot period.
  
  
  CONCLUSIONS
  Pilot results support the feasibility and value of YEMAS, an automated SMS-based text messaging data collection system positioned within a secure university environment. This approach capitalizes on immediate data transfer protocols and enables the documentation of participants' thoughts, feelings, and behaviors in real time. Data are collected using mobile devices that are familiar to participants and nearly ubiquitous in developed countries.
authors.affiliation: University of Minnesota, School of Nursing, Minneapolis, MN, United States. garcia@umn.edu.
authors.forename: Carolyn
authors.initials: C
authors.lastname: Garcia
authors.forename: Rachel R
authors.initials: RR
authors.lastname: Hardeman
authors.forename: Gyu
authors.initials: G
authors.lastname: Kwon
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Lando-King
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Therese
authors.initials: T
authors.lastname: Genis
authors.forename: Sonya S
authors.initials: SS
authors.lastname: Brady
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Kinder
keywords: data collection; intervention research; longitudinal; texting; trajectory
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