condition mean min max ZT0-3 9.221864 9.221864 9.221864 ZT4-7 8.791144500000001 8.791144500000001 8.791144500000001 ZT8-11 9.758952 9.758952 9.758952 ZT12-15 9.168652 9.168652 9.168652 ZT16-19 9.045623500000001 9.045623500000001 9.045623500000001 ZT20-23 9.285662 9.285662 9.285662