condition mean min max ZT0-3 2.5310337499999997 1.3394925 3.722575 ZT4-7 3.56908 3.56908 3.56908 ZT8-11 4.6837800000000005 4.6837800000000005 4.6837800000000005 ZT12-15 0 0 0 ZT16-19 4.388625 4.388625 4.388625 ZT20-23 3.305275 3.305275 3.305275