The phrase "and is frequently defined" is correct and usable in written English.
It can be used when discussing a term or concept that has a common or widely accepted definition.
Example: "The term 'sustainability' is often used in environmental discussions and is frequently defined as the ability to meet present needs without compromising future generations."
Alternatives: "and is often described" or "and is commonly characterized".
Chronic back pain (upper and lower) is a very common disorder that affects around 1 in 3 adults in the UK each year [ 1, 2] and is frequently defined as pain that has persisted for more than 12 weeks (www.britishpainsociety.org) [ 3, 4].
Binge drinking refers to high volume alcohol consumption over a short period of time, and is frequently defined as the consumption of four or more drinks at a single sitting for women, and of five or more drinks at a single sitting for men [ 8].
The unit of analysis is often an acute hospital and outcome is frequently defined in terms of a risk-adjusted mortality (inhospital or 30-day).
This position raises the question of who defines an act as deviant and highlights that deviance is frequently defined in relative (norm-violating) rather than absolute (lawbreaking) terms.
For statistical and public administrative purposes, however, old age is frequently defined as 60 or 65 years of age or older.
Guidance may also be gained from a recent manuscript of assessing CE-MS performancerformance [42] of the performance of a biomarker is frequently defined by its sensitivity and specificity.
Occupant injury in real world vehicle accidents can be significantly affected by a set of crash characteristics, of which impact direction and impact location (or damage location) in general scale interval (e.g., frontal impact is frequently defined as general damage to vehicle frontal end with impact angle range of 11 1 o'clock) have been identified to associate with injury outcome.
"Elderly" is frequently defined in the literature as over 65 years of age, and the safety and effectiveness of vaginal prolapse surgery has been analysed in this group previously.
Therefore, the largest generating unit in a load dominated area is frequently defined as RMR unit in the operating order to secure the operation of power system.
While acknowledging that reference to science could be interpreted as encompassing the other disciplines, especially mathematics, the STEM acronym itself is frequently defined as simply "science" (e.g., Office of the Chief Scientist, 2014).
