median и median return busin.

[Daffodil3]

Как правильно перевести "median" и "median return" в след. контексте:
Beginning in January 2009, MFI portfolio delinquency levels began to deteriorate rapidly, with loans past due over 30 days (portfolio at risk [PAR30]) jumping from a median of 2.2 percent to 4.7 percent during the first five months of 2009, while profitability dropped from a median return on equity (ROE) of nearly 18 percent at year-end 2008 to 6 percent by May 2009.

ЗС

[YelenaPestereva]

медианная доходность