Evaluation of a Mobile Health Intervention to Improve Sexual and Reproductive Health Outcomes Among Kenyan Adolescents Living in Urban Informal Settlements

Change in respondents' confidence in their ability to abstain from sex. Example item: "I can refuse sex when I don't feel like having sex." Five summed items. Response options are on a 5-point Likert scale (Strongly disagree to Strongly agree).

Change in respondents' confidence to negotiate and use condoms. Example item: "I can negotiate condom use with a potential partner". Eight summed items. Response options are on a 5-point Likert scale (Strongly disagree to Strongly agree).

Change in respondents' perceptions about the advantages of delaying sex. Example item: "Waiting until I am older before I have sex will… Help me achieve my life's goals." Five summed items. Response options are on a 5-point Likert scale (Strongly disagree to Strongly agree).

Change in respondents' perceptions about the disadvantages of delaying sex. Example item: "Waiting until I am older before I have sex will… Make me look old-fashioned." Four summed items. Response options are on a 5-point Likert scale (Strongly disagree to Strongly agree).

Change in respondents' perceptions about condom use. Example item: "It is OK to use condoms." Five summed items. Response options are on a 5-point Likert scale (Strongly disagree to Strongly agree).

Change in respondents' beliefs about perceived norms among people in one's life (friends, parents, other family, boyfriend/girlfriend) concerning delaying sex. Example item: "Most of my friends think that I should wait until I am older before I have sex." Four summed items. Response options are on a 5-point Likert scale (Strongly disagree to Strongly agree).

Change in respondents' beliefs about perceived norms among people in one's life (friends, parents, other family, boyfriend/girlfriend) concerning condoms. Example item: "My friends think that I should carry a condom." Four summed items. Response options are on a 5-point Likert scale (Strongly disagree to Strongly agree).

Change in respondents' intention to have sex within next month, 6 months, a year.

Example item: "I intend to have sex within the next month." Three items summed and averaged. Response options are on a 5-point Likert scale (Strongly disagree to Strongly agree). Responses are inversely coded to reflect intention to abstain from sex.

Change in respondents' intention to use a condom during sexual intercourse. Single item: "I plan to use a condom when I have sexual intercourse." Response options are on a 5-point Likert scale (Strongly disagree to strongly agree).

Change in respondents' sexual behavior. Example item: "Have you had vaginal sex with anyone in the past 6 months?" (yes/no). Three items to assess any sexual activity (i.e., anal, oral, and vaginal sex).

Change in how often respondents had sex in past month. Single item: "In the past month, how frequently did you have sex?" Five response options from "Zero times" to "More than four times a week."

Condom used at last sex reported in survey. Single item: "Did you or your partner use a condom the last time your had sex?" (yes/no).

Condom use frequency reported in survey. Single item: "In the past month, how frequently did you use a condom when having sex?" Five response options ("Never, none of the time" to "Always, every time").

Measures change in knowledge about sexually transmitted infections (STIs), sexual behavior, and pregnancy. Example item: "Can a person who looks strong and healthy be HIV positive?" (yes/no) Items will be summed and averaged.

Respondents' self-reported STI symptoms. Example item: "Do you currently have any of the following symptoms?... Sore or lesions in your genital area or anus" (yes/no). Six items will be used to derive prevalence and distribution of STI symptoms.

Respondents' self-reported history of pregnancy and impregnating someone. Example item: "Are you or your partner currently pregnant?""

Two survey items assessing intentions to test and treat STIs. Example item: "I plan to visit a clinic to test for STIs if I have symptoms." Two summed items. Response options are on a 5-point Likert scale (Strongly disagree to strongly agree). Items were newly created for this study.

Increase in intention to use SRH services. Single item: "I plan to visit a clinic for family planning services." Response options are on a 5-point Likert scale (Strongly disagree to strongly agree). Item was newly created for this study.

Percent of Digital Champions retained (number retained at end of intervention period divided by total number hired) based on program administration records.

Average of 6 items about acceptability on post intervention survey. Example item: "Overall, how acceptable did you find the Digital Champions?" Response options are on a 5-point Likert scale. Items were adapted from a questionnaire based on the Theoretical Framework of Acceptability.

Cost effectiveness is computed as the cost of intervention divided by the number of adolescents served. Program cost data will be obtained from labor costs of program and Digital Champion staff in addition to other AskDoki program costs.

Cost per adolescent who makes progress on outcome measures. Cost effectiveness is computed as the cost of intervention divided by the number of positive outcomes. The cost effectiveness ratios we compute will depend on what outcomes increase significantly relative to the comparison group. Program cost data will be obtained from labor costs of program and Digital Champion staff in addition to other AskDoki program costs.