condition mean min max ZT0-3 2.1924200000000003 2.1924200000000003 2.1924200000000003 ZT4-7 1.60351 1.60351 1.60351 ZT8-11 1.383045 1.383045 1.383045 ZT12-15 0.94158 0.94158 0.94158 ZT16-19 1.6334499999999998 1.6334499999999998 1.6334499999999998 ZT20-23 1.581585 1.581585 1.581585