condition mean min max ZT0-3 46.351625 44.44045 48.2628 ZT4-7 18.92125 18.92125 18.92125 ZT8-11 24.403950000000002 24.403950000000002 24.403950000000002 ZT12-15 0 0 0 ZT16-19 41.3154 41.3154 41.3154 ZT20-23 36.17035 36.17035 36.17035