condition mean min max ZT0-3 0.684096198 0.22631821600000002 1.1418741799999998 ZT4-7 3.9867746580000003 3.9120337525 4.0615155635 ZT8-11 3.35005927875 2.965307085 3.7348114724999997 ZT12-15 31.988728980749997 21.721724621499998 42.25573334 ZT16-19 55.103786215 42.50887904 67.69869339 ZT20-23 123.20829286 98.18831807000001 148.22826765