condition mean min max ZT0-3 5.282115 5.282115 5.282115 ZT4-7 2.867645 2.867645 2.867645 ZT8-11 1.79766 1.79766 1.79766 ZT12-15 1.68595 1.68595 1.68595 ZT16-19 4.356215 4.356215 4.356215 ZT20-23 7.543200000000001 7.543200000000001 7.543200000000001