The phrase "as an additional variable and" is correct and usable in written English.
It can be used when introducing another factor or element in a discussion, particularly in academic or technical contexts.
Example: "In our analysis, we considered temperature as an additional variable and its impact on the results."
Alternatives: "as a supplementary variable" or "as an extra variable".
Starting from the classical Shallow Water Equations, considering the bed level as an additional variable, and adding to the system an equation imposing its time invariance, we show that this wave is a contact wave, across which one of the Riemann invariants, namely the energy, is not constant.
These observations did not change when age was taken as an additional variable and linear/logistic regression models were employed (data not shown).
For the adjusted SOFA, age was added into the model as an additional variable and the GCS component from the SOFA score was extracted and inserted as a separate variable.
Missing values for confounders were treated as an additional variable category, and included in the model.
Missing values for confounders were treated as an additional variable category, and were included in the model.
This leads to a bias when diabetes is not entered as an additional variable in multivariate models and is especially true, when significant differences in esRAGE levels are evident between diabetes patients and healthy controls [ 6].
To correct for age, logisitic regression models were used with acceptor/refuser as response and age as an additional variable.
Since DLDB might open or close during the study period, the number of surveys in which each DLDB was found to be open for business was counted as an additional variable that might relate to the health and viability of the shop.
Membrane formation using a compressed antisolvent is analogous to conventional immersion precipitation using liquid nonsolvents and introduces pressure as an additional variable for tailoring the membrane microstructure.
The authors demonstrate the utility of the Cost Time Index and recommend its use as an additional variable in future studies regarding recruitment strategies in clinical trials.
These findings were similar in proportional hazards regressions using forward stepwise selection and that included sex as an additional variable.
