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Table 1 Level of quality of evidence (GRADE)

From: Effects of aerobic exercise on pain and disability in patients with non-specific chronic low back pain: a systematic review protocol

Quality level
High quality
• There are consistent findings among at least 75% of participants.
• Consistent low risk of bias, with accurate data and no known or suspected publication bias.
• Future studies are unlikely to change the estimated results.
Moderate quality
• There is moderate confidence in the estimated effect.
• Future studies are likely to have a significant impact on the confidence of the treatment effect estimation and may alter the treatment effect estimate.
Low quality
• Confidence in the treatment effect is limited.
• Additional research is very likely to have a significant impact on the confidence of the estimated treatment effect and it is likely to change the estimate.
Very low quality
• Confidence in the estimated treatment effect is very limited.
• Results are uncertain.