"mixed in terms of" is correct and usable in written English.
You can use it to refer to a situation in which a variety of elements have been combined together in an unspecified way. For example: "The student's essay was well-written but the argument was mixed in terms of logic and structure."
The crowd for that occasion at the Mineirão was a proper Brazilian crowd, in that it was mixed, in terms of creed and class.
I have always taught in schools that are very mixed in terms of socio-economic profile, with high proportions of free school meals and English as an additional language.
Because the blithely mixed (in terms of both gender and ethnicity) and entirely up-for-it crowd had already grasped the nub of the issue – which is that the cynicism and enervation that Drake's backstory tends to inspire in the unconverted are exactly the moods that his music subtly and gleefully conspires to banish.
In Cyprus, student groups are mixed in terms of gender, ethnic background, and learning ability.
There are only 15 published school-based sleep health promotion programs, and findings are mixed in terms of their impact on sleep behavior, knowledge and health outcomes.
Communities located close to most waterbodies are mixed in terms of the combination of different professions (e.g. farmers, fishers, agricultural and non agricultural day laborers, full-time workers in formal employment, and businessmen).
Thus, they are similar to mixed ANOVA but offer advantages over traditional mixed ANOVAs in terms of more power and the ability to handle unbalanced designs and missing data (e.g., Kliegl, Wei, Dambacher, Yan, & Zhou, 2011).
Our first finding was that people prefer a mixed solution in terms of surface allocation: the wood meadow mix (75% woodland, 25% meadow) is at the top of the sample preferences.
We described the conceptual differences between mixed and marginal beta regression models and compared both models to the commonly used linear mixed model in terms of overall fit and predictive accuracy.
There is mixed news in terms of rebuilding civil society.
Heisler's subsequent pictures were a mixed bag in terms of quality.
