condition mean min max ZT0-3 3.4252416666666665 3.12922 3.86481 ZT4-7 1.27239 1.27239 1.27239 ZT8-11 0.766025 0.766025 0.766025 ZT12-15 3.0649249999999997 2.160545 3.969305 ZT16-19 2.72735 2.72735 2.72735 ZT20-23 2.85311 2.85311 2.85311