condition mean min max ZT0-3 3.214155 3.214155 3.214155 ZT4-7 1.57237 1.57237 1.57237 ZT8-11 2.52076 2.52076 2.52076 ZT12-15 3.6025400000000003 3.6025400000000003 3.6025400000000003 ZT16-19 4.93872 4.93872 4.93872 ZT20-23 4.110675 4.110675 4.110675