condition mean min max ZT0-3 1.11267775 0.7809655 1.4443899999999998 ZT4-7 1.9622950000000001 1.9622950000000001 1.9622950000000001 ZT8-11 1.1777205 1.1777205 1.1777205 ZT12-15 0 0 0 ZT16-19 1.632965 1.632965 1.632965 ZT20-23 1.34998 1.34998 1.34998