condition mean min max ZT0-3 137.078211 137.078211 137.078211 ZT4-7 128.313224 128.313224 128.313224 ZT8-11 115.096303 115.096303 115.096303 ZT12-15 121.760533 121.760533 121.760533 ZT16-19 117.5217535 117.5217535 117.5217535 ZT20-23 112.7734925 112.7734925 112.7734925