condition mean min max ZT0-3 4.1166 3.2683600000000004 4.96484 ZT4-7 10.10168 10.10168 10.10168 ZT8-11 30.22505 30.22505 30.22505 ZT12-15 0 0 0 ZT16-19 31.797600000000003 31.797600000000003 31.797600000000003 ZT20-23 51.17965 51.17965 51.17965