condition mean min max ZT0-3 6.534285 5.690785 7.377784999999999 ZT4-7 2.81736 2.81736 2.81736 ZT8-11 2.57212 2.57212 2.57212 ZT12-15 0 0 0 ZT16-19 4.0346400000000004 4.0346400000000004 4.0346400000000004 ZT20-23 4.709865000000001 4.709865000000001 4.709865000000001