condition mean min max ZT0-3 24.315475 19.91855 28.712400000000002 ZT4-7 9.855825 9.855825 9.855825 ZT8-11 10.306975000000001 10.306975000000001 10.306975000000001 ZT12-15 0 0 0 ZT16-19 31.47255 31.47255 31.47255 ZT20-23 26.90945 26.90945 26.90945