condition mean min max ZT0-3 3.784815 3.4165200000000002 4.15311 ZT4-7 4.681685 4.681685 4.681685 ZT8-11 3.4730299999999996 3.4730299999999996 3.4730299999999996 ZT12-15 0 0 0 ZT16-19 4.14148 4.14148 4.14148 ZT20-23 5.75863 5.75863 5.75863