condition mean min max ZT0-3 15.017025 13.167950000000001 16.8661 ZT4-7 17.607999999999997 17.607999999999997 17.607999999999997 ZT8-11 15.274799999999999 15.274799999999999 15.274799999999999 ZT12-15 0 0 0 ZT16-19 25.41085 25.41085 25.41085 ZT20-23 24.0778 24.0778 24.0778