Colour version: Kaplan-Meier estimate of survival curve of lymphoid leukaemia (ICCC3 Ia), cases with and without Turkish descent diagnosed 1980–87 and 1996–2005 followed up until 12/2006. Black line: non-Turkish cases diagnosed 1996–2005 (507 events/4559 cases). Blue line: Turkish cases diagnosed 1996–2005 (32 events/265 cases). Grey line: non-Turkish cases diagnosed 1980–87 (719 events/2361 cases). Light blue line: Turkish cases diagnosed 1980–87 (52 events/105 cases).