condition mean min max ZT0-3 0.061204875 0.061204875 0.061204875 ZT4-7 0.025005116666666667 0.025005116666666667 0.025005116666666667 ZT8-11 0.01832755 0.01832755 0.01832755 ZT12-15 0.023255849999999998 0.023255849999999998 0.023255849999999998 ZT16-19 0.06914047499999999 0.06914047499999999 0.06914047499999999 ZT20-23 0.057760374999999996 0.057760374999999996 0.057760374999999996