Mean values for postintervention patient QOC and QEOLC were 6.5 ( 95 % CI , 6.2 to 6.8 ) and 8.3 ( 95 % CI , 8.1 to 8.5 ) respectively , compared with 6.3 ( 95 % CI , 6.2 to 6.5 ) and 8.3 ( 95 % CI , 8.1 to 8.4 ) for control conditions .