The phrase "are a valid indicator" is correct and usable in written English.
You can use it when discussing something that serves as a reliable measure or sign of a particular condition or quality.
Example: "The results of the survey are a valid indicator of customer satisfaction with our services."
Alternatives: "serve as a reliable measure" or "act as a credible sign".
Iorio R, Healy WL, Appleby D. Preoperative demand matching is a valid indicator of patient activity after total hip arthroplasty.
We propose that excess risk-adjusted, postoperative length of stay (poLOS) is a valid indicator of an adverse outcome.
But if the rhetoric from the 17,000 participants from 124 countries at the largest AIDS conference ever held is a valid indicator, there was an overwhelming consensus for supporting prevention and treatment because one cannot work without the other.
Self-rated health (SRH) is known to be a valid indicator for the prediction of health outcomes.
Two listening experiments were conducted in order to determine whether A-weighting is a valid indicator of the perceived loudness or annoyance of road-traffic sound.
More critical, biological questions including whether convergence of taxa abundance and composition is a valid indicator of similar ecological function remain to be answered.
When used to choose among design alternatives, a prototype should be as realistic as possible, to ensure that the data on which the decision is based will be a valid indicator of what would happen in the real world.
For a measurement endpoint to be a valid indicator of the risk of a negative impact of management on the assessment endpoint, a predictable and quantifiable link must be made between the two.
Pupillary response is a valid indicator of mental workload and is being increasingly leveraged to identify lower cost moments for interruption, evaluate complex interfaces, and develop further understanding of psychological processes.
