Table 4

Overall similarity index of included articles (n=495)

Overall similarity indexNo of articles (%)
0–10%137 (28)
11–20%202 (41)
21–30%104 (21)
31–40%34 (7)
41–50%13 (3)
51–60%2 (0.4)
61–70%3 (0.6)
71–100%0