condition mean min max ZT0-3 7.43546 6.362985 8.507935 ZT4-7 5.386855 5.386855 5.386855 ZT8-11 6.1299600000000005 6.1299600000000005 6.1299600000000005 ZT12-15 0 0 0 ZT16-19 7.26004 7.26004 7.26004 ZT20-23 7.343825 7.343825 7.343825