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Table 1 Characteristics of Included studies

From: Auricular acupuncture with seed or pellet attachments for primary insomnia: a systematic review and meta-analysis

Study Sample Size* Randomized Method Treatment Control Course Outcome Measurements Follow-Up Safety Assessment
(Male/Female) of Bias**
Chen 2012 [46] 16/20 14/22 NR SV Diazepam 30 Days Effective rate NR NR ?,?,-,?,+,?,?
Chyi Lo 2013 [58] 0/14 0/13 Random Number Table MP Sham AA >21 Days PSG, PSQI NR NR +,?,+,-,+,+,-
Hisghman 2006 [60] 1/10 1/9 Computer Software MP Stainless Steel Pellet 17 Days PSQI Sleep Diary, ISI, MOS SF-12, TEQ 12 Days NR +,+,+,?,+,+,-
Hu 2010 [47] 22/10 18/13 NR SV Diazepam 28 Days Effective rate, PQSI, AIS NR NR +,-,-,-,+,-,-
Jiang 2010 [48] 14/49 10/52 Random Number Table SV Sham AA 20-25 Days PSQI NR NR +,-,+,-,+,+,-
Jin 2012 [49] 13/27 15/25 NR MP Estazolam 7-14 Days Effective rate, TESS NR Reported +,-,-,?,?,?,?
Lin 2007 [59] 16/14 17/13 NR SV Sham AA 51 Days Effective rate, EEG, PQSI NR NR ?,?,+,?,+,-,-
Liu 2008 [50] 26/74 37/63 Computer Software MP Sham AA 30 Days PSQI NR NR +,?,+,?,-,-,-
Luo 2010 [51] 11/10 9/12 NR SV Estazolam 30 Days Effective rate, PQSI NR NR ?,?,-,?,-,-, -
Pi 2012 [52] 71/79 75/75 Computer Software SV Sham AA 8 Weeks PSQI NR NR +,-,+,-,-,-,-
Suen 2002 [57] 10/110*** NR MP/SV Junci Medulla Attachment 21 Days Sleep Diary, Actigraphy 0.5-1 Year NR ?,?,+,+,+,-,-
Wang 1993 [53] 10/20 12/18 NR SV Diazepam 20 Days Effective rate, SCL-90 NR Reported ?,?,-,?,+,-,-
Wang 2002 [54] 17/13 14/16 NR MP Diazepam 3-10 Days Effective rate NR NR ?,?,-,?,+,-,-
Wei 2010 [55] 22/14 21/15 NR NR Estazolam 28 Days Effective rate, Sleep Efficiency NR Reported ?,?,-,?,?,?,-
Zhang 2008 [56] 10/58 8/50 Random Number Table MP Estazolam 18 Days Effective rate NR Reported ?,?,-,?,?,?,-
  1. Abbreviations: NR Not Reported, SV Semen Vaccariae Attachment, MP Magnetic Pearls Attachment, AA Auricular Acupuncture,PGSPolysomnography, PSQI Pittsburgh Sleep Quality Index, MOS SF-12 Medical Outcomes Study Short Form-12, TEQTreatment Expectancy Questionnaire, AIS Athens Insomnia Scale, TESS Treatment Emergent Symptom Scale, EEG electroencephalogram, SCL-90 Symptom CheckList-90. *Sample Size: sample size of treatment groups are on the left column, control groups on the right. **Assessment of Bias: the seven domains were random sequence generation, allocation concealment, blinding personnel and participants, blinding assessor, incomplete data outcome, selective reporting, and other forms of bias from left to right. +: low risk, - : high risk, ?: *** In study Suen 2002, the male to female ratio was not reported after grouping.