condition mean min max ZT0-3 0.331086319 0.213820046 0.448352592 ZT4-7 0.49985040725 0.2807773255 0.718923489 ZT8-11 1.5046463355000002 0.3733946855 2.6358979855 ZT12-15 7.462802966 4.654376581499999 10.2712293505 ZT16-19 13.3830465225 12.870273815000001 13.89581923 ZT20-23 9.02820293475 6.463275289499999 11.59313058