condition mean min max ZT0-3 37.324457 37.324457 37.324457 ZT4-7 29.685787 29.685787 29.685787 ZT8-11 12.798299 12.798299 12.798299 ZT12-15 22.902554000000002 22.902554000000002 22.902554000000002 ZT16-19 9.5006395 9.5006395 9.5006395 ZT20-23 11.5028395 11.5028395 11.5028395