condition mean min max ZT0-3 15.77715 12.828800000000001 19.70765 ZT4-7 5.999095 5.999095 5.999095 ZT8-11 8.479325 8.479325 8.479325 ZT12-15 10.5057525 9.417805000000001 11.5937 ZT16-19 11.67875 11.67875 11.67875 ZT20-23 17.29215 17.29215 17.29215