condition mean min max ZT0-3 9.143260000000001 8.869465 9.417055000000001 ZT4-7 10.438649999999999 10.438649999999999 10.438649999999999 ZT8-11 9.094255 9.094255 9.094255 ZT12-15 0 0 0 ZT16-19 12.5433 12.5433 12.5433 ZT20-23 12.8897 12.8897 12.8897