The phrase "vary per" is correct and usable in written English.
It is used to indicate a difference between two or more items that are being compared. For example, "The prices of these two items vary per size and style."
These numbers slightly vary per source as the 5000 most varying genes selected from each microarray data set differ.
Dec. 2. Times vary per event.
Times and days vary per session.
Delivery and collection times vary per location.
But "moderate intensity" can vary per person.
International fees vary per course and are between £13,810 and £16,480.
Costs vary per year depending on the construction season, weather conditions, etc".
While amounts vary per state, the average one-time grant was $417 in the 2011 fiscal year.
The new rules vary per country, barring entry into the United States of immigrants and nonimmigrants from Chad, Libya and Yemen, on business, tourist or business-tourist visas.
Liz Noble: "This will vary per programme, trainees will need to complete their training programme – but this will often involve the opportunity to experience different departments or projects as part of it.
The cost of an interest hike will vary per household, depending on the terms of the mortgage, how long it is taken out for, and whether it is on a fixed or a variable rate.
