condition mean min max ZT0-3 1.4991645 0.45932 3.089627 ZT4-7 0.516355 0.516355 0.516355 ZT8-11 1.457925 1.457925 1.457925 ZT12-15 0.3084125 0.0 0.616825 ZT16-19 0.0 0.0 0.0 ZT20-23 2.545425 2.545425 2.545425