condition mean min max ZT0-3 820.539749 820.539749 820.539749 ZT4-7 888.0373864999999 888.0373864999999 888.0373864999999 ZT8-11 851.5322925 851.5322925 851.5322925 ZT12-15 1012.9018255 1012.9018255 1012.9018255 ZT16-19 1141.4674805 1141.4674805 1141.4674805 ZT20-23 1064.6905925 1064.6905925 1064.6905925