condition mean min max ZT0-3 5.47872489875 4.7163315005 6.241118297000001 ZT4-7 3.29853846925 2.689837678 3.9072392605 ZT8-11 3.745246148 3.3959845205 4.0945077755 ZT12-15 4.54381398725 4.1308654915 4.956762483 ZT16-19 5.87026005725 4.7196824095 7.020837705 ZT20-23 11.996052250249999 10.022829330499999 13.96927517