Skip to main content

Table 4 Level of certainty definitions used for assessment of summary conclusions (adapted from [59, 60])

From: The relationship between physical fitness attributes and sports injury in female, team ball sport players: a systematic review

Level of certainty Definition
High The relationships investigated included evidence from at least two, level I studies with a summary conclusion revealing consistent results. The summary conclusion is unlikely to be strongly affected by future studies.
Moderate The relationships investigated included evidence from either of the following: (i) only one, level I study and level II and/or level III/IV studies with a consistent summary conclusion; (ii) at least two, level II studies with a consistent summary conclusion; or (iii) level I and/or level II studies with an inconsistent summary conclusion. As more information becomes available, the summary conclusion could change.
Low The relationships investigated included evidence from either: (i) only one, level II study and level III/IV studies with consistent or inconsistent results; or (ii) level III/IV studies only with consistent or inconsistent results. More information is needed to be certain of the summary conclusion.
Insufficient The relationships investigated included evidence from only one study (regardless of level of evidence) or with an unknown summary conclusion, indicating < 5 relationships were investigated. More research is needed to establish a relationship summary conclusion.
  1. Consistent result includes a summary conclusion of ‘clear association’ or ‘no association’. Inconsistent result includes a summary conclusion of ‘inconsistent association’