Table 2

Quality characteristics of eligible studies

Study (author, reference, and publication yr)Quality scorea
Total (0–7)Q1Q2Q3bQ4Q5Q6
Delaney et al. (34) (2007)6112011
Dial et al. (17) (2008)4110011
Hirschhorn et al. (19) (1994)6111111
Kuntz et al. (9) (2011)7112111
Levy et al. (20) (2000)3101001
Naggie et al. (36) (2011)4100111
Wilcox et al. (27) (2008)3100101
  • a The six study quality assessment questions and scoring method are given in “Quality assessment” in Materials and Methods.

  • b Scored on a scale from 0 to 2.