condition mean min max ZT0-3 3.89689216775 2.5296582615 5.264126074 ZT4-7 7.35305493175 3.7764916920000005 10.9296181715 ZT8-11 23.2765285575 17.43286631 29.120190805 ZT12-15 79.1431638275 64.83740717 93.448920485 ZT16-19 57.2989392675 50.660767105000005 63.93711143 ZT20-23 47.20342942 40.839680539999996 53.5671783