The effectiveness of text message based health literacy on medication adherence in patients with type 2 diabetes mellitus: a randomized controlled trial

INTERVENTION: Received biweekly text messages on their cellphones to take their medication and improve their health literacy for 6 months. Received biweekly text messages on their cellphones to only take their medication for 6 months. CONDITION: type 2 diabetes mellitus PRIMARY OUTCOME: change in medication adherence from baseline to 6 months. SECONDARY OUTCOME: Change or percent change in following items from baseline to 1, 3, 6 months.; ; 1) Medication adherence; 2) Health literacy; 3) HbA1c; 4) self efficacy INCLUSION CRITERIA: 1) Japanese. 2) Age >=18 years old. 3) The reason of hospitalization is to take the education of diabetes. 4) HbA1c >= 6.5%. 5) Taking oral medications or injectable medication. 6) To be able to get and access text messages on their cell phone. 7) Don't be diagnosed the depression. 8) Received informed consent.