condition mean min max ZT0-3 3.3815875 3.16132 3.601855 ZT4-7 4.22225 4.22225 4.22225 ZT8-11 3.684435 3.684435 3.684435 ZT12-15 0 0 0 ZT16-19 4.73291 4.73291 4.73291 ZT20-23 3.97613 3.97613 3.97613