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Internal validity
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1
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Indicates reliability of outcome measures
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A positive point was assigned if a minimum sampling duration of 90 s and/or 3–5 reps was used
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2
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Clear presentation of balance assessment
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A positive point was assigned if replication of the experiment is possible based on the information in the article
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3
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Correction for confounding effect on dependent variables
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Positive points were assigned if confounders were taken into account, or appropriate matching on these variables was performed
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3a Study controls for age
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3b Study controls for gender
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3c Study controls for height
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3d Study controls for body mass
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Statistical validity
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4
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The use of appropriate statistical tests
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A positive point was assigned if appropriate tests were used to assess differences in balance
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5
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Adequate sample size
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A positive point was assigned if a minimum of 20 subjects per group were included
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External validity
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6
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Sufficient information about the subject’s characteristics
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Positive if information was provided about
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6a Adequate information regarding age
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6b Adequate information regarding gender
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6c Adequate information regarding height
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6d Adequate information regarding body mass
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6e Adequate information regarding severity of curve (Cobb angle)
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