The phrase "a valid proxy to" is correct and usable in written English.
It can be used when discussing a substitute or representative that can stand in for something else in a specific context.
Example: "In this study, we found that the survey results serve as a valid proxy to measure customer satisfaction."
Alternatives: "an acceptable substitute for" or "a reliable stand-in for".
Furthermore, although the use of a 24-hour recall to construct the DDS does not account for within-person variance, the DDS is considered to be a valid proxy indicator to reflect nutrition adequacy and is often employed in low resource settings [ 37].
Moreover, it has been considered a valid proxy measure to evaluate the clinical status in pre-term infants [ 10].
Because its primary source is traffic emissions, NO2 is considered to be a valid proxy for exposure to air pollution from traffic.
However, the World Health Organization, in its formulation of MetS diagnostic criteria, considered BMI as a valid proxy of waist-to-hip ratio (Alberti et al, 2006).
Therefore bedtime exposure levels were not considered to be a valid proxy of night time exposure and had to be excluded from the analyses [ 22].
These results demonstrate the feasibility of using satellite data to derive a valid proxy measure for individual long-term exposure to PM2.5 in a typical Asian city with high population density in areas with complicated terrain.
Therefore, the ratio of the incremental costs of opioid abuse to the costs incurred by non-abusers in the US was assumed to be a valid proxy for the ratio of the incremental costs of RxO abuse to those incurred by patients in the EU5 countries with chronic pain conditions.
Having said this, the exit interview proved to be a valid proxy measure of malaria case management practice in regards to the provision of clinical actions.
Due to these results bedtime exposure levels were not considered to be a valid proxy of night time exposure.
