"indirect proportion" is a correct and usable phrase in written English
You can use it to describe a situation in which two things are inversely related to each other. For example, "As the price of oil increased, the purchasing power of consumers decreased in an indirect proportion."
We had been living several blocks away in a one-bedroom apartment, whose 450 square feet seemed to be shrinking in indirect proportion to our daughter's age, and we were in desperate need of more space.
Susceptibility testing was performed by the indirect proportion method on Lowenstein-Jensen media at the National Institute of Health in Lima; personnel performing the culture were unaware of these clinical or radiological characteristics.
Diagnosis of MDR-TB was performed at GENETUP TB-laboratory which functions as the National Reference Laboratory in the capital Kathmandu using the indirect proportion method on Löwenstein-Jensen Löwenstein-Jensen
In addition, drug sensitivity test was done using the indirect proportion and 24 well plate methods.
Susceptibility testing for isoniazid (INH) and rifampicin (RIF) was done using the indirect proportion method.
The sensitivity to antituberculous drugs was determined by the indirect proportion method.
Samples were processed at the national reference laboratory and tested for susceptibility to rifampicin and isoniazid with direct NRA, direct MODS and the indirect LJ proportion method as reference.
M. tuberculosis isolates underwent confirmatory drug-susceptibility testing at the Centers for Disease Control and Prevention CDCC) using the indirect agar proportion method for isoniazid, rifampin, ethambutol, and fluoroquinolones (ofloxacin and ciprofloxacin critical concentrations of 2µg/ml); MGIT 960 medium was used for pyrazinamide susceptibility testing.
a With the exception of PZA, susceptibility for all drugs was performed by the 1% indirect agar proportion method.
Baseline isolates of Mycobacterium tuberculosis were shipped in batches to CDC for DST using the indirect agar proportion method on Middlebrook 7H10 agar according to the Clinical Laboratory Standards Institute standard as previously described (13 ).
Antimicrobial susceptibility testing was performed in the Philippines and confirmed in the United States using Clinical and Laboratory Standards Institute guidelines [ 15] with the 1% indirect agar proportion method used for all antimicrobial agents except pyrazinamide.
