They studied 397 patients for an average of 64 months.

The donors were followed for an average of six months after their surgery.

The boys stay at the jail for an average of four to eight months.

They waited an average of six months for housing, and more than half died in the hospital while waiting.

Children stay an average of 18 months in foster homes.

The patients were followed for an average of 42 months from their initial 90-day exposure.

Houses stay on the market for an average of three months and sell at or just below the asking price.

The patients were followed for an average of 20 months.

They kept the jobs for an average of just eight months.

The study included 1,218 patients at 17 hospitals who were followed for an average of 29 months.