condition mean min max ZT0-3 27.40075 27.40075 27.40075 ZT4-7 31.279700000000002 31.279700000000002 31.279700000000002 ZT8-11 25.723508333333335 25.723508333333335 25.723508333333335 ZT12-15 25.881925000000003 25.881925000000003 25.881925000000003 ZT16-19 22.1047 22.1047 22.1047 ZT20-23 24.2697 24.2697 24.2697