condition mean min max ZT0-3 300.116587 300.116587 300.116587 ZT4-7 528.257561 528.257561 528.257561 ZT8-11 614.789398 614.789398 614.789398 ZT12-15 581.8089795 581.8089795 581.8089795 ZT16-19 372.853336 372.853336 372.853336 ZT20-23 273.4945205 273.4945205 273.4945205