condition mean min max ZT0-3 11.61044 7.19997 16.4456 ZT4-7 5.803319999999999 5.803319999999999 5.803319999999999 ZT8-11 6.544475 6.544475 6.544475 ZT12-15 17.877425000000002 16.7569 18.997950000000003 ZT16-19 13.969750000000001 13.969750000000001 13.969750000000001 ZT20-23 15.15005 15.15005 15.15005