condition mean min max ZT0-3 3.0510124999999997 2.9146549999999998 3.1873699999999996 ZT4-7 2.680225 2.680225 2.680225 ZT8-11 9.313775 9.313775 9.313775 ZT12-15 0 0 0 ZT16-19 8.86892 8.86892 8.86892 ZT20-23 4.317155 4.317155 4.317155