condition mean min max ZT0-3 1.895165 1.6701 2.1202300000000003 ZT4-7 0.9300470000000001 0.9300470000000001 0.9300470000000001 ZT8-11 1.2791299999999999 1.2791299999999999 1.2791299999999999 ZT12-15 0 0 0 ZT16-19 2.25161 2.25161 2.25161 ZT20-23 2.346255 2.346255 2.346255