condition mean min max ZT0-3 282.576877 282.576877 282.576877 ZT4-7 43.553908 43.553908 43.553908 ZT8-11 29.007613499999998 29.007613499999998 29.007613499999998 ZT12-15 64.0507115 64.0507115 64.0507115 ZT16-19 91.7175545 91.7175545 91.7175545 ZT20-23 72.024996 72.024996 72.024996