condition mean min max ZT0-3 4.7114975 3.863595 5.5594 ZT4-7 4.130915 4.130915 4.130915 ZT8-11 3.38458 3.38458 3.38458 ZT12-15 0 0 0 ZT16-19 4.229215 4.229215 4.229215 ZT20-23 5.97747 5.97747 5.97747