condition mean min max ZT0-3 5.5356950000000005 5.5356950000000005 5.5356950000000005 ZT4-7 2.432075 2.432075 2.432075 ZT8-11 4.10546 4.10546 4.10546 ZT12-15 3.86142 3.86142 3.86142 ZT16-19 10.212105000000001 10.212105000000001 10.212105000000001 ZT20-23 7.3253900000000005 7.3253900000000005 7.3253900000000005