Intervention
PMS
Women received enough explanation regarding the intervention when they singed informed consent (roles of each investigator in the study, period, date of fallow up, completion of electronic questionnaires, online joining video, and other related details). Free of charge internet was given to all three groups to participate in the online class. The online intervention was conducted in all three groups for 6 weeks (84 women with PMS) by the first investigator in collaboration with the second (principal investigator T.F., third (A.N. for taking vitamin D3 intervention), and fourth researchers (H.Z. for online positive-oriented counseling group intervention). A WhatsApp group was formed for each of the three groups (six subgroups). Women (n = 28) with 25-hydroxyvitamin D3 levels less than 30 ng/ml (blood samples of women in this group who signed informed consent measured in Arsanjan Dr. Rahim laboratory) received free of charge six vitamin D3 tablets (pearl) (50,000 IU vitamin D3, approved by FDA, made by the Zahravi factory) for six weeks (one pearl/week) recommended by the national vitamin D3 insufficiency prophylactic therapy protocol of the Ministry of Health and Medical Education of IranFor two other groups the online positive-oriented counseling and online lifestyle modification training sessions were held in the form of online group chats, PowerPoint presentations, and video clips, and question–answer. Women were informed they can participate in online sessions with an anonymous id to protect their rights of privacy and confidentiality if they like.The intervention for the online positive-oriented counseling group (n = 28) was conducted in groups for six weeks, each session lasting 90 min in the form of online group chats, PowerPoint presentations, and video clips, and question–answer. The strategies of sessions presented based on related studiesStrategies of the intervention for the online positive-oriented counseling, and online lifestyle modification training.Looking for the positive side of life, explaining the positive psychology pyramid and its various domains in lifePositive subjective experiences (savoring, happiness, gratification, fulfillment, kindness, forgiveness, and flow) in daily life