condition mean min max ZT0-3 48.226885 9.228425 125.964 ZT4-7 44.778999999999996 44.778999999999996 44.778999999999996 ZT8-11 12.54195 12.54195 12.54195 ZT12-15 8.639442500000001 5.254985 12.023900000000001 ZT16-19 7.64778 7.64778 7.64778 ZT20-23 6.788465 6.788465 6.788465