condition mean min max ZT0-3 5.655415 5.263109999999999 6.04772 ZT4-7 4.096489999999999 4.096489999999999 4.096489999999999 ZT8-11 8.1817 8.1817 8.1817 ZT12-15 0 0 0 ZT16-19 7.48749 7.48749 7.48749 ZT20-23 5.993615 5.993615 5.993615