condition mean min max ZT0-3 25.268675 23.712000000000003 26.82535 ZT4-7 18.4958 18.4958 18.4958 ZT8-11 19.647100000000002 19.647100000000002 19.647100000000002 ZT12-15 0 0 0 ZT16-19 22.1848 22.1848 22.1848 ZT20-23 23.575899999999997 23.575899999999997 23.575899999999997