condition mean min max ZT0-3 14.2810068875 12.208197455 16.35381632 ZT4-7 7.6304658737499995 7.244797188 8.0161345595 ZT8-11 7.76979217275 5.98932529 9.5502590555 ZT12-15 11.019242669499999 10.360170905 11.678314433999999 ZT16-19 9.514445567750002 9.06190246 9.966988675500001 ZT20-23 13.07062509 12.443838425 13.697411755000001