condition mean min max ZT0-3 1141.994965 1141.994965 1141.994965 ZT4-7 1038.9936635 1038.9936635 1038.9936635 ZT8-11 993.4518635000001 993.4518635000001 993.4518635000001 ZT12-15 1058.14362 1058.14362 1058.14362 ZT16-19 1435.128409 1435.128409 1435.128409 ZT20-23 1328.1870975 1328.1870975 1328.1870975