condition mean min max ZT0-3 9.73888889 9.73888889 9.73888889 ZT4-7 9.143888889 9.143888889 9.143888889 ZT8-11 10.44 10.44 10.44 ZT12-15 7.641111111333333 7.641111111333333 7.641111111333333 ZT16-19 8.627777778 8.627777778 8.627777778 ZT20-23 9.36111111 9.36111111 9.36111111