SKIEN, Norway: Doctors said Thursday they saw no major change in mass murderer Anders Behring Breivik’s health in prison, dealing a blow to his lawsuit against the Norwegian state over his jail conditions.

The rightwing extremist, who killed 77 people in a 2011 bombing and gun massacre, claims his almost five-year isolation constitutes “inhuman” treatment that violates his human rights.

The 37-year-old has complained of apathy, headaches, insomnia and concentration problems which have, he claims, prevented him from pursuing his political science studies since December.

“The reports (by nurses who see him regularly in prison) have always shown that his emotional state (and) his interaction with the medical staff have been perfectly adequate,” Bjorn Draugedalen, the doctor of the Skien Prison in southern Norway where Breivik is incarcerated, told the court.

“He has had a good, calm and balanced attitude. His reasoning has been clear ... He doesn’t seem to be bothered that much,” Draugedalen said.

Breivik’s lawyer, Oystein Storrvik, criticized the medical observations, noting that they were conducted behind a glass partition separating the killer from the medical staff.

Storrvik read extracts from a report written by Norway’s pointman on human rights in November, which concluded that Breivik’s prison regime “represents an elevated risk of inhumane treatment.”

Several of the recommended improvements have since been implemented.