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Table 1 Description of optional interpersonal and lifestyle interventions used in the study
| Content | Key points |
|---|---|
| Social interactions | Three coaching programs: (i) Positive interaction in a relationship, (ii) Resolving conflicts in a relationship, or (iii) Coaching exercises for families with children. The weekly coaching email message included information, practical advice, and an exercise respectively on each subject based on a cognitive behavioral approach and positive thinking. |
| Weight management | Weekly email messages consisted of information, practical advice and exercises on weight management (e.g. managing appetite, eating, portion size, and buying food). |
| Healthy diet | Weekly email messages about healthy diet and practical advice for improvement, and also links to further readings. |
| Exercise | Weekly email messages aimed at reaching the minimum goal for health promoting physical exercise (at least 2.5 h of brisk physical exercise weekly or 9000 steps daily). Messages included information about health-related physical activity, and practical advice and assignments. |
| Sleep improvement | Weekly email message containing information, practical advice and exercises on good sleep (e.g. sleep hygiene, environment, and relaxation) and links to further readings. |
| Alcohol use management | Cognitive behavioral program of two weekly messages to analyze reasons and situations of alcohol use and advice to avoid excessive alcohol use and how to cope with temptations. |
| Smoking cessation | Cognitive behavioral program of two weekly messages to analyze reasons and situations of smoking, mental exercise, and support for quitting. |
