condition mean min max ZT0-3 4.6601225 4.5507 4.769545 ZT4-7 6.796405 6.796405 6.796405 ZT8-11 9.86505 9.86505 9.86505 ZT12-15 0 0 0 ZT16-19 6.32047 6.32047 6.32047 ZT20-23 6.777345 6.777345 6.777345