condition mean min max ZT0-3 0.14588946666666666 0.1440835 0.14895144999999999 ZT4-7 0.067446 0.067446 0.067446 ZT8-11 0.354575 0.354575 0.354575 ZT12-15 0.8752687499999998 0.5955374999999999 1.1549999999999998 ZT16-19 0.559437 0.559437 0.559437 ZT20-23 0.527028 0.527028 0.527028