condition mean min max ZT0-3 40.135556525 19.969698049999998 60.301415000000006 ZT4-7 38.543100935 34.072904315 43.013297555 ZT8-11 10.46207341625 4.8369437135 16.087203118999998 ZT12-15 77.8850832925 30.641743990000002 125.12842259499999 ZT16-19 293.754514775 255.32466140000002 332.18436815 ZT20-23 469.67754825 403.29719435 536.05790215