| Study | Diagnostic criteria for OSAHS | Duration of treatment | Experimental treatment | Control treatment | Main outcome |
| Freire et al., 2007 [22] | PSG 15 < AHI < 30 | 10 weeks | MA: (Gv20, Li20, Ren23, P6, Lu7, Li4, St36, St40, Sp6, Kd6) 30 min, deqi | Control: weight reduction advice and sleep hygiene counseling SA: (acupoints were 1 cun from the real point) 30 min, no manipulation | AHI, AI, HI, mean SaO2 |
| Chen et al., 2008 [23] | PSG AHI > 5 | 20 days | MA: (Cv23, Panglianquan, Si17, L7, K6, Sp4, Cv17, S40, H7, Sp6, extra6) 30 min, deqi | nCPAP: once a day, 20 days in total | AHI, AI, HI, mean SaO2 |
| Freire et al., 2010 [24] | PSG 15 < AHI < 30 | 1 night | MA: (Lu6, Lu7, Li4, Li20, Gv20, Cv23, St36, St40, Sp6, Ki6, Extra12) 30 min, deqi 2 Hz EA: (Cv23, Extra12, Li4, St36) 30 min, 0.6–0.8 mA, 2 Hz 10 Hz EA: (Cv23, Extra12, Li4, St36) 30 min, 0.6–0.8 mA, 10 Hz | No specific treatment reported | AHI, AI, HI, mean SaO2 |
| Zhang, 2014 [25] | PSG AHI > 5 | 20 days | 2 Hz EA: (Cv23, Panglianquan) once a day | No specific treatment reported | AHI, AI, HI |
| Zhang et al. 2014 [26] | PSG AHI > 5 | 4 weeks | MA: (Li11, S25, Sp9, S40, Liv3) 30 min, deqi; weight reduction advice and smoking cessation | nCPAP: details are not reported; weight reduction advice and smoking cessation | AHI, mean SaO2 |
| Song et al., 2015 [27] | PSG AHI > 15 | 6 weeks | nCPAP + 2 Hz EA: (Extra8, Extra9, Extra6, H7, St36, Sp6, K6) 2 Hz, 30 min | nCPAP: 3 times a week, 6 weeks in total | AHI |
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