The phrase "adding variables such as" is correct and usable in written English.
It can be used when discussing the inclusion of specific elements or factors in a context, such as in mathematics, programming, or research.
Example: "In our analysis, we will be adding variables such as age, income, and education level to better understand the trends."
Alternatives: "including factors like" or "incorporating elements such as".
The best-fit equation to predict FFM from linear regression modeling was achieved by adding variables, such as weight, sex, and age to the basic model, bringing adjusted R to 89% (standard error = 0.90, p<0.001) that explained 89% of variance in FFM estimated by a deuterium oxide dilution method (34).
Adding variables such as car ownership and an indigenous weighting in an index as seen in the Index of Rural Access could increase the score for high needs communities and more adequately indicate the level of service required.
The level of complexity was increased stepwise by adding specific variables such as age, physical activity level and total energy intake as covariates to the model.
Then this local GDD is applied to the whole of Svalbard (GDD1) and refined stepwise by adding environmental variables such as cloud fraction, land surface temperature, sea surface temperature, distance to the ocean and number of snow-free days.
Finally, we added control variables such as parents' age and marital status to construct a full model.
The final data source is personal income tax files (T1), which add demographic variables such as age, sex, family status, and area of residence.
Thus, we added control variables such as physician characteristics (i.e., physician age, years of experience, specialty, practice type, training location, and CCOP Principal Investigator (PI) status), as we believed these characteristics would both influence physicians' perceptions of climate and their ability to enroll patients in cancer clinical trials.
In Model 4, we also added study-related variables, such as completion of a course on finance or mathematics, and study progress in number of semesters.
We also added other demographic variables such as race, ethnicity, and sex, based on face validity.
In the final model, the added contribution of psychological variables such as lack of perceived control, self-reported environmental sensitivity and the coping styles of problem-solving and avoidance was evaluated; a significant impact on NSPS was found for lack of perceived control and increased environmental sensitivity and avoidance, but not for problem-solving.
In particular, we questioned whether adding biomarkers to the clinical variables, such as SOFA score, high-sensitivity C-reactive protein (CRP), and WBC would improve the prediction of mortality in sepsis.
