condition mean min max ZT0-3 4.871255 4.5626 5.17991 ZT4-7 3.63537 3.63537 3.63537 ZT8-11 5.622545000000001 5.622545000000001 5.622545000000001 ZT12-15 0 0 0 ZT16-19 5.639335 5.639335 5.639335 ZT20-23 4.65756 4.65756 4.65756