condition mean min max ZT0-3 6.734245 6.58214 6.88635 ZT4-7 7.75535 7.75535 7.75535 ZT8-11 3.54027 3.54027 3.54027 ZT12-15 0 0 0 ZT16-19 7.42308 7.42308 7.42308 ZT20-23 8.882905000000001 8.882905000000001 8.882905000000001