condition mean min max ZT0-3 10.888826 10.888826 10.888826 ZT4-7 12.384857499999999 12.384857499999999 12.384857499999999 ZT8-11 12.420797 12.420797 12.420797 ZT12-15 10.5291645 10.5291645 10.5291645 ZT16-19 11.7402 11.7402 11.7402 ZT20-23 11.5025035 11.5025035 11.5025035