fa Psychology and Psychiatry Original Article <p style="text-align: justify;"><span style="font-family:Times New Roman;"><strong>Background:</strong>&nbsp;Introduction: Since birth, a stressful experience, self-efficacy and self-confidence play an important role in mother&#39;s perception of delivery. Today, yoga is used to control anxiety and increase the sense of self-efficacy in different areas. The purpose of this study is to determine the effect of yoga on the self-efficacy of primiparous women.<br> <strong>Methods</strong>:&nbsp;This randomized clinical trial was conducted in 2017 on 60 primiparous women aged 18-40 and referred to Zahedan health centers. The participants were randomly assigned to two groups of intervention and control. During the weeks 26-27 of pregnancy, 30 mothers of the intervention group, received 12-15 sessions of Yoga exercises and 30 mothers of control group received normal care. Data were collected using a demographic an self-efficacy questionnaires. The pre-test was completed at week 26 and post-test at weeks 34-36 with two weeks in between; the data was analyzed using paired t-test Mann-Whitney and chi-square tests, linear regression tests and SPSS 16.<br> <strong>Results:&nbsp;</strong>The mean of self-efficacy score before intervention in the experimental and control group was (78.43 &plusmn; 24.7) and (62.69 &plusmn; 21.74) and after the intervention (124.45 &plusmn; 13.26) and (16.33&plusmn;92.75) respectively, and (P=0001).<span dir="RTL"></span><br> <strong>Conclusions:</strong> After the intervention, the mean of self-efficacy increased. It seems that Yoga has been used to increase self-efficacy of primiparous women in the second and third trimesters.</span></p> yoga, primiparous, self-efficacy 0 0 http://nmj.goums.ac.ir/browse.php?a_code=A-10-965-10&slc_lang=fa&sid=1 Azam Evin aazam.avin2080@gmail.com 10031947532846006542 10031947532846006542 Yes Department of Midwifery, Faculty of Nursing and Midwifery, Zahedan University of Medical Sci-ences, Zahedan, Iran Farnoosh Khojasteh 10031947532846006543 10031947532846006543 No Department of Midwifery, Faculty of Nursing and Midwifery, Zahedan University of Medical Sci-ences, Zahedan, Iran Hossein Ansari 10031947532846006544 10031947532846006544 No Department of Epidemiology, Faculty of Health, Zahedan University of Medical Sciences, Zahedan, Iran