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Table 2 Characteristics of reports

From: Quality of randomized controlled trials of new generation antidepressants and antipsychotics identified in the China National Knowledge Infrastructure (CNKI): a literature and telephone interview study

  Reports with refused interviews; n = 51 Reports for which authors could not be contacted; n = 29 Reports with successful interviews; n = 58
Sample size per study arm
 Less than 30 14, 27.5% 3, 10.3% 10, 17.2%
 30 to 60 32, 62.7% 22, 75.9% 39, 67.2%
 60 to 100 3, 5.9% 3, 10.3% 8, 13.8%
 More than 100 2, 3.9% 1, 3.4% 1, 1.7%
Primary outcome between groups
 P < 0.05 35, 68.6%, 21, 72.4% 33, 56.9%
P ≥ 0.05 16, 31.4% 8, 27.6% 22, 37.9%
 Others (multiple outcomes showed different results) 0 0 3, 5.2%
Assessed to be at low risk of bias based on published reports
 1. Sequence generation 7, 13.7% 4, 13.8% 16, 27.6%
 2. Allocation concealment 0 0 0
 3. Blinding of at least one available object 0 0 2, 3.4%
 4. Intention-to-treat analysis 47, 92.2% 25, 86.2% 52, 89.7%
 5. Registered protocol 0 0 0
Hospital’s level where the study was conducted
 Hospitals affiliated with medical universities 2, 3.9%* 7, 24.1% 13, 22.4%
 Level 3 hospitals (including hospitals affiliated with medical universities) 23, 45.1% 15, 51.7% 27, 46.6%
 Level 2 hospitals 24, 47.1% 9, 31.0% 27, 46.6%
 Level 1 hospitals 1, 2.0% 0 1, 1.7%
 No information 3, 5.9% 5, 17.2% 3, 5.2%
Published in core journal
 Core Journal from list of Beijing University Library (2014 version) 0 1, 3.4% 2, 3.4%
 Core Journal from list of China Scientific and Technical Papers and Citations Database (2016 version) 5, 9.8%* 5, 17.2% 21, 36.2%
  1. Comparisons were made between the studies with successful interviews (reference) and the studies for which the authors could not be contacted and the studies for which the authors refused the interview using one-way ANOVA for sample size or Fisher’s exact test as appropriate. *: p < 0.05 compared with the reference