condition mean min max ZT0-3 39.905775000000006 39.2879 40.52365 ZT4-7 33.79985 33.79985 33.79985 ZT8-11 37.0965 37.0965 37.0965 ZT12-15 0 0 0 ZT16-19 79.8248 79.8248 79.8248 ZT20-23 85.19925 85.19925 85.19925