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Table 2 The ORBIT classification system for missing or incomplete outcome reporting [10].

From: Assessing the potential for outcome reporting bias in a review: a tutorial

Classification Description Level of reporting Level of suspicion of ORB
Clear that the outcome was measured and analysed
A States outcome analysed but only reported that result not significant (typically stating p-value > 0.05). Partial High risk
B States outcome analysed but only reported that result significant (typically stating p-value < 0.05). Partial Low risk
C States outcome analysed but insufficient data presented to be included in meta-analysis or to be considered to be fully tabulated. Partial Low risk
D States outcome analysed but no results reported. None High risk
Clear that the outcome was measured
E Clear that outcome was measured but not necessarily analysed. None High risk
F Clear that outcome was measured but not necessarily analysed. None Low risk
Unclear that the outcome was measured
G Not mentioned but clinical judgment says likely to have been measured and analysed. None High risk
H Not mentioned but clinical judgment says unlikely to have been measured. None Low risk
Clear that the outcome was NOT measured
I Clear that outcome was not measured. N/A No risk