The duration of the interventions was 45 days, with a follow-up period of one moth.

A list of the seafarers’ names in the Port and Maritime Organization of the Islamic Republic of Iran in Genaveh port was generated (n = 1000). Based on the list, one thousand random numbers were generated using R software (version 3.6.0). The first 136 seafarers of the list were selected. One of the researchers contacted with the seafarers phone number and informed them about the study objectives. All the participants who were contacted initially (n = 136) agreed to participate in the study and fulfilled the eligibility criteria (Fig. 1). The decision about determining the time of completing the instrument was made with the seafarers’ consent. The instrument was filled out in a private room at the maritime health center of Genaveh port. Eligible participants were provided with the information about the trial and, if willing, entered the study. The participants were free to ask the researcher their questions about the study. After obtaining written informed consent of the seafarers and providing them with detailed contact information including the participant’s cell number, the data were registered in the cell phone of one of the trial researchers. Then, the instruments were completed by the participants.

Follow-up of study participants

The participants were followed 1 month after the education delivered via text messages and completed the instrument again to determine the changes in adopting skin cancer preventive behaviors and PMT variables. The seafarers who missed their scheduled visit for 1 month were actively followed by one of the research staff and their reasons were obtained.

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