condition mean min max ZT0-3 4.614235000000001 4.16697 5.0615000000000006 ZT4-7 4.30335 4.30335 4.30335 ZT8-11 4.337515 4.337515 4.337515 ZT12-15 0 0 0 ZT16-19 3.866765 3.866765 3.866765 ZT20-23 4.807945 4.807945 4.807945