The phrase "a middle stratum" is correct and usable in written English.
It can be used in contexts discussing layers, levels, or classifications within a hierarchy or system.
Example: "In the ecological study, we focused on a middle stratum of the forest, which is home to various species of birds and insects."
Alternatives: "an intermediate layer" or "a central tier".
In a series of surveys over the last decade, sociologists led by Li Peilin, of the China Academy of Social Sciences, concluded that it was "incorrect to believe that the middle stratum is a force for stability".
Therefore, those who exhibit the most violent behavior occupy the uppermost social status in prison while a majority of offenders inhabit the middle stratum; Ostracized groups, such as sex offenders, occupy the lowest class (Marshall et al. 2000; Miller 2000; Archer 2002).
According to Carroll, the middle stratum encompassed broad abilities (approximately 10) such as learning, retrieval ability, speediness, visual perception, fluid intelligence, and the production of ideas.
They also find that self-identified "middle stratum" is more stable and more easily form of common social attitudes and behavioral preferences (Li and Zhang 2008).
We found positive relationships between sapling density and fragment size for the tree species of middle stratum, and between sapling density and forest cover at landscape level for the species of upper stratum.
I begin with a sketchy scenario in order to demonstrate the trinocular perspective in action: suppose that the middle stratum is the semantic one, then the stratum 'above' is context, and the one essential material element is a human being in relation with another: the roles they bear is that of 'speaker/addressee'speaker/addressee
In the middle stratum, UADT cancer deaths fell by 27% (30 to 22 per 100,000) and smoking-attributable proportions fell by 35% (20 to 13 per 100,000).
Similarly, economic hardship increases by 0.28 (CI: 0.03 0.53, p < 0.05) for the low education stratum, by 0.32 (CI: 0.20 0.44, p < 0.001) for the middle stratum, but is statistically indistinguishable from the economic hardship associated with raising a single child in the high education stratum.
We observed more group differences in the values of diabetes-related markers in strata comprising younger and older men (18 29 years and 40 66 years) than in the middle stratum (30 39 years).
As regards external validity, the results obtained in the Pró-Saúde study cohort may represent an approximation to what is occurring in the middle strata of the economically active population of Brazil's major metropolises.
