condition mean min max ZT0-3 8.076509999999999 8.076509999999999 8.076509999999999 ZT4-7 5.049325 5.049325 5.049325 ZT8-11 5.78567 5.78567 5.78567 ZT12-15 7.979585 7.979585 7.979585 ZT16-19 10.177735 10.177735 10.177735 ZT20-23 8.88665 8.88665 8.88665