condition mean min max ZT0-3 9.51165 8.50304 10.52026 ZT4-7 7.95152 7.95152 7.95152 ZT8-11 7.647639999999999 7.647639999999999 7.647639999999999 ZT12-15 0 0 0 ZT16-19 7.599745 7.599745 7.599745 ZT20-23 8.294215 8.294215 8.294215