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Table 1 Comparison of Whiting et al .’s and Gao et al .’s systematic reviews

From: Should we search Chinese biomedical databases when performing systematic reviews?

Review characteristic

Whitinget al.2010 [12]

Gaoet al.2012 [11]

Primary aim

To compare the accuracy of anti-CCP antibodies and rheumatoid factor in diagnosing rheumatoid arthritis in patients with early symptoms of the disease

To determine the accuracy of anti-CCP antibody in diagnosis of patients with rheumatoid arthritis in a Chinese population

Databases searched

MEDLINE, Embase, Science Citation Index, BIOSIS, ISI Web of Science, System for Information on Grey Literature in Europe, Zetoc, National Technical and Information System, Dissertation Express

MEDLINE, CNKI

Timeframe for searches

Inception to September 2009

January 2000 to June 2010

Language restrictions

None

English and Chinese

Number of studies included

  

Total

151a

118

English language

130

4

Chinese Language

5

114

Other non-English languages

20

0

Summary estimate of sensitivity (95% CI)

68% (65 to 71)b

65% (65 to 66)

Summary estimate of specificity (95% CI)

95% (94 to 96)b

95% (95 to 96)

  1. a151 studies corresponding to 155 publications were included; bEstimates from case-control studies (n = 97). Anti-CCP, anti-cyclic citrullinated peptide; CI, confidence interval; CNKI, China National Knowledge Infrastructure.