condition mean min max ZT0-3 6.023279068 3.099346033 8.947212103 ZT4-7 3.35328290225 3.240130726 3.4664350785 ZT8-11 4.90338331025 3.6320636970000004 6.1747029235 ZT12-15 6.4988573065 5.5653537275 7.4323608855 ZT16-19 7.80102577825 6.7118191885 8.890232368 ZT20-23 9.5478020475 9.029657322 10.065946773