condition mean min max ZT0-3 2.76234 2.76234 2.76234 ZT4-7 1.53185 1.53185 1.53185 ZT8-11 1.8898199999999998 1.8898199999999998 1.8898199999999998 ZT12-15 3.135365 3.135365 3.135365 ZT16-19 3.52782 3.52782 3.52782 ZT20-23 2.7271900000000002 2.7271900000000002 2.7271900000000002