"average proportions" is a correct and usable phrase in written English.
You can use it to describe the relative size of something compared to others like it. For example: "The skyscraper had average proportions compared to the others in the city."
Characters who might seem distractingly bigger than life have been shrunk to average proportions, so we can identify with them more fully as creatures of our time and place.
The violin was early recognized for its singing tone, especially in Italy, its birthplace, where the earliest makers Gasparo da Salò, Andrea Amati, and Giovanni Paolo Maggini had settled its average proportions before the end of the 16th century.
Thus, remittances represent quite sizable average proportions of the household expenditure budgets.
Circles indicate the average proportions of inorganic As (iAs) to sum of As species in each genotype.
The average proportions of the plant species were 27.8% Lolium perenne, 6.1% Dactylis glomerata, 10.4% Trifolium repens, and 9.0% Taraxacum officinale.
The average proportions of sailfish for all fleets were always above 0.9, being a little higher (above 0.95) in the second and fourth quarters.
Average proportions of per-person lost productive time were, for migraine, 4.5% from paid work, 5.3% from household work; for pMOH they were 29.2% and 16.0%.
*The percentages in brackets show the average proportions of time spent for travel and for each type of in-home and out-of-home activity.
The average proportions of questions answered appropriately in English and then using the instrument were 16.7% and 85.5%, respectively, with mean improvement of 68.8% (confidence interval: 45.6 92.1).
ANOVA results show that the average proportions of all behavioral categories were significantly different when comparing the Genie 3 students to those in traditional classrooms.
The average proportions of intracellular constituents (ICs) released during ingestive mastication were 265, 203 and 364 g/kg of ICs ingested for neutral detergent soluble (NDS), intracellular N and water-soluble carbohydrates (WSC), respectively.
