condition mean min max ZT0-3 0.011882811 0.0 0.023765622 ZT4-7 0.023820957333333333 0.0 0.04764191466666667 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.012305164 0.0 0.024610328 ZT20-23 0.0 0.0 0.0