condition mean min max ZT0-3 21.258675000000004 20.82975 21.687600000000003 ZT4-7 19.386400000000002 19.386400000000002 19.386400000000002 ZT8-11 21.82995 21.82995 21.82995 ZT12-15 0 0 0 ZT16-19 19.90905 19.90905 19.90905 ZT20-23 24.75785 24.75785 24.75785