condition mean min max ZT0-3 2.2407825 2.16715 2.314415 ZT4-7 2.5065 2.5065 2.5065 ZT8-11 2.301 2.301 2.301 ZT12-15 0 0 0 ZT16-19 2.774355 2.774355 2.774355 ZT20-23 2.59704 2.59704 2.59704