By Stephanie Stahl

PHILADELPHIA (CBS) — Radiologists and orthopedic surgeons make the most money and pediatricians the least, according to a Medscape online survey of 24,00 doctors from 25 medical specialties.

The highest paid doctors make on average $315,000 a year, the lowest $156,000.

The survey also found that a doctor’s specialty may make less of a pay difference than their sex. Female doctors make 40% less than their male peers.

Overall physician incomes have been declining since 2010 and are expected to continue to fall.

RELATED LINK: Medscape Online Survey