Omron Connect app available on a participant's smartphone connects to the participant's home Omron blood pressure monitor via bluetooth technology. The Omron Connect app, which stores the blood pressure readings and provides reminders to the participant via push notifications also communicates with the Way to Health research platform via Internet connection.

Determined by change in pre-pilot and post-pilot scores on responses regarding self-efficacy using the Self-Efficacy for Managing Chronic Disease 6-Item Scale. Answer range from 1 = not at all confident to 10= totally confident, with higher scores indicating higher self-efficacy.

Determined by change in pre-pilot and post-pilot scores on responses regarding self-management using the Partners in Health Scale for Chronic Condition Self-Management (11 items). Answers range on a linear scale provided: very good=0, 1, 2, 3, 4=satisfactory, 5, 6, 7, 8= very poor. Total range of scores 0-88, with higher scores indicating better self-management.

Determined by change in pre-pilot and post-pilot scores on responses regarding eHealth literacy Scale (eHEALS). eHEALS consists of eight questions with 5 response options on a Likert-scale, and scored as a cumulative score of the eight questions (total range 8-40) with higher scores indicating better eHealth literacy (a score of ≥32 is considered to be adequate eHealth literacy).

Determined by change in pre-pilot and post-pilot scores on responses regarding disease-related quality of life using the Kidney Disease Quality of Life 36-item survey (KDQOL-36). Scores are reported separately for each of the three KDQOL-36 subscales: Symptoms and Problems (12 items), Burden of Kidney Disease (4 items), and Effects of Kidney Disease (8 items); all items have 5 response options. Each sub-scale scores are transformed to 0 to 100 with higher scores indicating better quality of life.

Mean systolic blood pressure after 4, 8, and 12 weeks

Mean step count in first week, and after 4, 8, and 12 weeks.

Determined by transmitting at least one BP monitored reading or daily step count each week.

Qualitative reports describing adaptions that were made to the SMART-HABITS program in response to participant feedback, including descriptions of alterations that were made to the schedule of reminders and messaging content. Participant feedback data will be collected with field notes from verbal conversations and textual data from email and text messages.

Sex frequency of randomized participants compared to the published sex frequency of the US population with CKD (female approximately 55%)

Frequency of race groups (Black, White other) of participants at time of randomization compared to the approximate frequency---- of the US population with CKD (black race group = 18%, white race group = 75%)

Determined by the comparison of ethnicity (Hispanic, Non-Hispanic) frequency (percentage) of the randomized participants compared to ethnicity frequency of the general population with chronic kidney disease stage in the United States (Hispanic = ~13%).

Determined by the number of blood pressure assessments and step counts performed divided by the number of assessments recommended. Good adherence will be determined by greater than or equal to 70 percent performed out of the recommended.

Participants receiving intervention

Determined through change in pre- and post-study scores on the three attitude statements toward mHealth, entitled Attitudes Toward Mobile Phone-Based Health Monitoring. Answers reported on 5-point Likert scale ranging from 1= strongly disagree, 2=disagree, 3=neither disagree or agree, 4=agree, to 5 = strongly agree (total range 3-15), with higher scores indicating better acceptability.

If reporting a score on a scale, please include the unabbreviated scale title, the minimum and maximum values, and whether higher scores mean a better or worse outcome.

The outcome measure was collected at 12 weeks (end of study) so all participants had completed both arms after the crossover, so all study participants who completed the end of study questionnaire were analyzed together regardless of arm.

Determined through satisfactory ratings on the System Usability Scale Survey (range is 0-100 with score above 68 considered adequate usability).

participants completing questionnaire at 4-weeks, 8 weeks and 12 weeks.

Determined by change in pre-pilot and post-pilot scores on responses regarding CKD knowledge using the 28-question Kidney Knowledge Survey (KiKS). The survey score is defined the percentage correct responses to each answered question divided by the total, total range 0-100%. Higher percentages indicate better knowledge.

If reporting a score on a scale, please include the unabbreviated scale title, the minimum and maximum values, and whether higher scores mean a better or worse outcome.

The outcome measure was collected at 12 weeks (end of study) so all participants had completed both arms of the crossover, so all study participants who completed the end of study questionnaire were analyzed together regardless of arm.

Determined by change in pre-pilot and post-pilot scores on responses regarding self-efficacy using the Self-Efficacy for Managing Chronic Disease 6-Item Scale. Answer range from 1 = not at all confident to 10= totally confident, with higher scores indicating higher self-efficacy.

The outcome measure was collected at 12 weeks (end of study) so all participants had completed both arms of the crossover, so all study participants who completed the end of study Self-Efficacy for Management Chronic Disease survey were analyzed together regardless of arm.

Determined by change in pre-pilot and post-pilot scores on responses regarding self-management using the Partners in Health Scale for Chronic Condition Self-Management (11 items). Answers range on a linear scale provided: very good=0, 1, 2, 3, 4=satisfactory, 5, 6, 7, 8= very poor. Total range of scores 0-88, with higher scores indicating better self-management.

The outcome measure was collected at 12 weeks (end of study) so all participants had completed both arms of the crossover, so all study participants who completed the end of study Partners in Health Scale for Chronic Condition Self-management were analyzed together regardless of arm.

Determined by change in pre-pilot and post-pilot scores on responses regarding eHealth literacy Scale (eHEALS). eHEALS consists of eight questions with 5 response options on a Likert-scale, and scored as a cumulative score of the eight questions (total range 8-40) with higher scores indicating better eHealth literacy (a score of ≥32 is considered to be adequate eHealth literacy).

The outcome measure was collected at 12 weeks (end of study) so all participants had completed both arms of the crossover, so all study participants who completed the end of study eHealth Literacy Scale (eHEALS) were analyzed together regardless of arm.

Determined by change in pre-pilot and post-pilot scores on responses regarding disease-related quality of life using the Kidney Disease Quality of Life 36-item survey (KDQOL-36). Scores are reported separately for each of the three KDQOL-36 subscales: Symptoms and Problems (12 items), Burden of Kidney Disease (4 items), and Effects of Kidney Disease (8 items); all items have 5 response options. Each sub-scale scores are transformed to 0 to 100 with higher scores indicating better quality of life.

The outcome measure was collected at 12 weeks (end of study) so all participants had completed both arms of the crossover, so all study participants who completed the end of study KDQOL-36 were analyzed together regardless of arm.

Mean systolic blood pressure after 4, 8, and 12 weeks

All study participants randomized.

Mean step count in first week, and after 4, 8, and 12 weeks.

The outcome measure was collected on daily basis regardless of BP communication arm at 4-, 8-, and 12 weeks.

Determined by transmitting at least one BP monitored reading or daily step count each week.

The outcome measure was collected at 12 weeks (end of study) regardless of arm and BP communication mode so participants were analyzed regardless of arm.

Qualitative reports describing adaptions that were made to the SMART-HABITS program in response to participant feedback, including descriptions of alterations that were made to the schedule of reminders and messaging content. Participant feedback data will be collected with field notes from verbal conversations and textual data from email and text messages.

Sex frequency of randomized participants compared to the published sex frequency of the US population with CKD (female approximately 55%)

Compare the frequency of demographic characteristic of all participants randomized to that of published frequency of demographics of the US population with CKD

Frequency of race groups (Black, White other) of participants at time of randomization compared to the approximate frequency---- of the US population with CKD (black race group = 18%, white race group = 75%)

Randomized participants

Determined by the comparison of ethnicity (Hispanic, Non-Hispanic) frequency (percentage) of the randomized participants compared to ethnicity frequency of the general population with chronic kidney disease stage in the United States (Hispanic = ~13%).

Participants who were randomized

Participants randomized to the mHealth app (Omron Connect) arm will receive reminder messages to check their BP via push notifications from the Omron Connect app at least three times weekly. Upon receipt of the BP reading to the research platform from Omron Connect, participants will receive automatic tailored text message feedback similar to the texting arm. Participants will asked to set a daily step goal of at least 3,000 steps per day and transmit their step count information from their FitBit. Participants will be reminded once a day to sync their FitBit. Motivating messages will be sent weekly. After 4 weeks, and 8 weeks of the study, a usability survey will be sent. Weekly and daily feedback will be sent. At the conclusion of week 6, individuals will "crossover" and will continue for an additional 6 weeks using the opposite technology to communicate BP readings.

mHealth app: Omron Connect app available on a participant's smartphone connects to the participant's home Omron blood pressure monitor via bluetooth technology. The Omron Connect app, which stores the blood pressure readings and provides reminders to the participant via push notifications also communicates with the Way to Health research platform via Internet connection.