condition mean min max ZT0-3 0.36816275 0.2474575 0.48886799999999997 ZT4-7 0.756425 0.756425 0.756425 ZT8-11 0.75569 0.75569 0.75569 ZT12-15 0 0 0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.489484 0.489484 0.489484