2.6. Software
Electronic versions of CES-D, GAD-7, and K6 were provided on participants’ smartphones using Google Forms. The questionnaires were presented in the order CES-D, GAD-7, and K6. The questions, answer choices, and order of questions in the electronic version are the same as those in the paper version of the three scales. Each questionnaire was presented on a separate page; however, all the questions for each questionnaire are displayed on the screen. Scrolling down the screen allows the user to move to the next answer. After answering all the questions in the questionnaire, the next questionnaire can be answered by pressing the “Next” button (specifically, the 20 questions in the CES-D are displayed on a single page, and after answering all of them, the “Next” button is pressed to move to the GAD-7 questionnaire page). Participants can select their answers by tapping the radio buttons on the screen. It is not possible to move to the next page without answering a question item or to select two answers to the same question. However, it is possible to change a previous answer by pressing the “Back” button.