| First author, year | Country | Sample size (I/C) | Gestational age (week) | Apgar score | Birth weight (g) | Intervention characteristics |
| Al-Abdi, 2014 [35] | Iran | 29/49 | 37-41 | 8-10 | 2800-3600 | 10 days, one time in each day, 15-20 minutes in each time. | Dalili, 2016 [36] | Iran | 27/28 | 37-41 | 8-10 | 2800-3600 | 4 days, three times in each day, 15-20 minutes in each time. | Babaei, 2018 [37] | Iran | 50/52 | 37-41 | 8-10 | ≥2500 | 4 days, one time in each day, 15-20 minutes in each time. | Basiri-Moghadam, 2015 [38] | Iran | 20/20 | 34-36 | 8-10 | 1500-2500 | 4 days, two times in each day, 20 minutes in each time. | Dehghani, 2019 [39] | Iran | 25/22 | 37-42 | 8-10 | ≥2500 | 7 days, two times in each day, 15 minutes in each time. | Eghbalian, 2017 [40] | Iran | 67/67 | 38-40 | 8-10 | No. reported | 4 days, two times in each day, 15-20 minutes in each time. | Jazayeri, 2021 [41] | Iran | 18/18 | ≥35 | No. reported | ≥2500 | 1 day, once in each day, 15 minutes in each time. | Karbandi, 2016 [42] | Iran | 25/23 | 30-37 | 8-10 | 1200-2000 | 5 days, three times in each day, 15 minutes in each time. | Lotfi, 2016 [43] | Iran | 25/25 | 30-36 | 8-10 | >1250 | 6 days, two times in each day, 15 minutes in each time. | Kenari, 2020 [44] | Iran | 30/30 | 37-42 | No. reported | >3000 | 3 days, once in each day, 15 minutes in each time. | Kianmehr, 2014 [45] | Iran | 18/16 | 36-38 | No. reported | 2500-400 | 4 days, three times in each day, 15 minutes in each time. | Moghadam, 2012 [33] | Iran | 16/18 | 37-42 | No. reported | 2500-400 | 2 days, three times in each day, 20 minutes in each time. | Nikzad, 2021 [46] | Iran | 30/30 | 37-42 | 8-10 | 2500-4000 | 2 days, three times in each day, 15 minutes in each time. | Seyyedrasooli, 2014 [14] | Iran | 25/18 | 37-42 | No. reported | 2500-400 | 4 days, once in each day, 15 minutes in each time. | Boskabadi, 2020 [47] | Iran | 30/30 | >30 | <7 | >2500 | 2 days, three times in each day, 20 minutes in each time. | Chen, 2011 [48] | Japan | 20/22 | 37-41 | 8-10 | 2800-3600 | 5 days, two times in each day, 15-20 minutes in each time. | Dağ, 2019 [1] | Turkey | 35/35 | ≥34 | No. reported | ≥1500 | 1 day, two times in each day, 15-20 minutes in each time. | Gözen, 2019 [49] | Turkey | 44/46 | 37-41 | 8-10 | 2500-4000 | 2 days, three times in each day, 5 minutes in each time. | Korkmaz, 2020 [50] | Iran | 27/29 | 37-42 | 8-10 | 2500-4000 | 1 day, two times in each day, 15 minutes in each time. | Lin, 2015 [13] | China | 27/29 | 37-41 | 8-10 | 2500-3600 | 3 days, two times in each day, 15-20 minutes in each time. |
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