condition mean min max ZT0-3 128.1331319 93.1096896 163.1565742 ZT4-7 36.327716370000005 32.455477115 40.199955625 ZT8-11 38.07907347 31.873047829999997 44.28509911 ZT12-15 30.051816332500003 25.589407190000003 34.514225475 ZT16-19 30.2639935375 29.93569535 30.592291725000003 ZT20-23 34.056659025 33.59323162 34.52008643