condition mean min max ZT0-3 179.899947 179.899947 179.899947 ZT4-7 187.80136 187.80136 187.80136 ZT8-11 162.4934245 162.4934245 162.4934245 ZT12-15 183.254729 183.254729 183.254729 ZT16-19 182.0300785 182.0300785 182.0300785 ZT20-23 194.0167805 194.0167805 194.0167805