condition mean min max ZT0-3 2.837365 2.74787 2.92686 ZT4-7 3.6768650000000003 3.6768650000000003 3.6768650000000003 ZT8-11 2.562615 2.562615 2.562615 ZT12-15 0 0 0 ZT16-19 5.287065 5.287065 5.287065 ZT20-23 4.4974 4.4974 4.4974