passages.id: split_4_test_87_passage
passages.type: progene_text
passages.text: The average isocentre shifts ( averaged on all patients ) were 3.0 mm ( +/- 1.4 mm , 1 SD ) for group B and 5.0 mm ( +/- 2.8 mm , 1 SD ) for group A against a value of 4.4 mm ( +/- 2.4 mm , 1 SD ) for the previously investigated non - immobilized patient group .