condition mean min max ZT0-3 4.9242550000000005 4.9242550000000005 4.9242550000000005 ZT4-7 2.872235 2.872235 2.872235 ZT8-11 5.43123 5.43123 5.43123 ZT12-15 4.55345 4.55345 4.55345 ZT16-19 7.501805 7.501805 7.501805 ZT20-23 6.947699999999999 6.947699999999999 6.947699999999999