condition mean min max ZT0-3 8.158625 8.158625 8.158625 ZT4-7 4.60651 4.60651 4.60651 ZT8-11 11.88965 11.88965 11.88965 ZT12-15 19.367150000000002 19.367150000000002 19.367150000000002 ZT16-19 18.234099999999998 18.234099999999998 18.234099999999998 ZT20-23 9.71974 9.71974 9.71974