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Table 2 Quality assessment score of the included studies

From: Comparison of single and dual growing rods in the treatment of early onset scoliosis: a meta-analysis

Quality assessment for non-randomized trials Thompson, GH Sponseller, PD Bess, S Uzumcugil, O Zhao, Y Akgul, T
A clearly stated aim 2 2 2 2 2 2
Inclusion of consecutive patients 2 2 2 1 1 1
Prospective data collection 0 0 1 0 2 2
End points appropriate to the aim of the study 2 0 2 2 2 2
Unbiased assessment of the study end point 0 0 0 0 0 0
A follow-up period appropriate to the aims of the study 2 2 2 2 2 2
Less than 5 % loss to follow-up 0 2 2 2 2 2
Prospective calculation of the sample size 0 0 0 0 0 0
An adequate control group 2 2 2 2 2 2
Contemporary groups 2 2 2 2 2 2
Baseline equivalence of groups 2 1 1 2 2 2
Adequate statistical analyses 2 0 2 2 2 2