condition mean min max ZT0-3 424.001288 424.001288 424.001288 ZT4-7 517.747 517.747 517.747 ZT8-11 497.020983 497.020983 497.020983 ZT12-15 424.51990950000004 424.51990950000004 424.51990950000004 ZT16-19 286.614623 286.614623 286.614623 ZT20-23 173.81263 173.81263 173.81263