condition mean min max ZT0-3 1.21740707375 0.949523983 1.4852901644999998 ZT4-7 3.40606124975 2.642300167 4.1698223325 ZT8-11 8.049506928749999 6.4004219695 9.698591888 ZT12-15 8.69352673725 8.5419221095 8.845131365 ZT16-19 5.287390826999999 4.7200662205 5.8547154335 ZT20-23 7.410338789 6.930465971 7.8902116069999995