condition mean min max ZT0-3 0.068211277 0.0 0.136422554 ZT4-7 0.0 0.0 0.0 ZT8-11 0.03846634383333333 0.0 0.07693268766666667 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.0 0.0 0.0