condition mean min max ZT0-3 8.705621666666666 3.9827199999999996 14.0576 ZT4-7 2.810675 2.810675 2.810675 ZT8-11 3.0903850000000004 3.0903850000000004 3.0903850000000004 ZT12-15 23.3674 19.4127 27.3221 ZT16-19 36.1255 36.1255 36.1255 ZT20-23 28.381 28.381 28.381