condition mean min max ZT0-3 1161.9 1161.9 1161.9 ZT4-7 274.4 274.4 274.4 ZT8-11 370.45 370.45 370.45 ZT12-15 393.75 393.75 393.75 ZT16-19 914.6999999999999 914.6999999999999 914.6999999999999 ZT20-23 1320.1999999999998 1320.1999999999998 1320.1999999999998