condition mean min max ZT0-3 4.529745 4.529745 4.529745 ZT4-7 2.146235 2.146235 2.146235 ZT8-11 3.929045 3.929045 3.929045 ZT12-15 4.838514999999999 4.838514999999999 4.838514999999999 ZT16-19 7.962815 7.962815 7.962815 ZT20-23 6.03693 6.03693 6.03693