condition mean min max ZT0-3 188.237577 188.237577 188.237577 ZT4-7 160.571106 160.571106 160.571106 ZT8-11 184.1882255 184.1882255 184.1882255 ZT12-15 179.5387245 179.5387245 179.5387245 ZT16-19 208.696629 208.696629 208.696629 ZT20-23 195.258861 195.258861 195.258861