Finally, not necessarily a limitation but a matter of the validity of our results is the inclusion of variables in the risk factor analysis.
According to COSMIN, this is the same because accurate detection of change means measuring the true amount of change, which is a matter of longitudinal validity.
However, as a matter of fairness and validity, it would be wrong for a test to measure aspects that were not intended.
The first GRADE criterion risk of bias is conceptually a matter of the internal validity of a scientific study.
Selective reporting of outcomes is a matter of the internal validity of an individual study, and should be included in the criterion for 'limitations to the study quality'.
Conceptually it is a matter of the internal validity of the study in situations where it has not been possible to document all relevant confounders, which therefore cannot be adjusted for in the statistical analysis.
Although differences between participants and non-participants should be a matter of concern to the validity, we believe the association between vertebral fracture and pulmonary function most likely did not differ between the participants in our study and eligible persons who did not attend.
In conclusion, these findings provide some evidence of a causal effect of triglyceride-related pathways on CHD risk independent of the effects of LDL-C and HDL-C, but the weight of evidence attributed to the findings is a matter of interpretation depending on the degree of validity attributed to the instrumental-variable assumptions.
And there is the matter of validity: what makes these requirements binding on its occupants?
