condition mean min max ZT0-3 4.52687040175 4.200904919 4.8528358845 ZT4-7 6.53687631725 4.562595694 8.5111569405 ZT8-11 18.07257458875 13.650072282500002 22.495076895 ZT12-15 20.0868658125 18.70276431 21.470967315 ZT16-19 12.147207328 11.712731761 12.581682895 ZT20-23 10.413872585250001 10.2875668455 10.540178325