condition mean min max ZT0-3 2.7136675 2.5790300000000004 2.848305 ZT4-7 2.29076 2.29076 2.29076 ZT8-11 1.796395 1.796395 1.796395 ZT12-15 0 0 0 ZT16-19 1.7422749999999998 1.7422749999999998 1.7422749999999998 ZT20-23 2.29446 2.29446 2.29446