condition mean min max ZT0-3 234.187599525 180.71540080000003 287.65979825 ZT4-7 174.39198657499998 150.402787 198.38118614999996 ZT8-11 75.0284670375 67.32231621 82.73461786499999 ZT12-15 48.6959209575 48.246275005 49.14556691 ZT16-19 77.21777902 69.870971605 84.564586435 ZT20-23 107.2899487 105.86638055 108.71351684999999