condition mean min max ZT0-3 60.0486 51.6048 68.4924 ZT4-7 29.64855 29.64855 29.64855 ZT8-11 4.347995 4.347995 4.347995 ZT12-15 0 0 0 ZT16-19 13.3638 13.3638 13.3638 ZT20-23 33.0784 33.0784 33.0784