condition mean min max ZT0-3 148.633558 148.633558 148.633558 ZT4-7 171.72062549999998 171.72062549999998 171.72062549999998 ZT8-11 140.115721 140.115721 140.115721 ZT12-15 149.76377050000002 149.76377050000002 149.76377050000002 ZT16-19 140.8177245 140.8177245 140.8177245 ZT20-23 137.601448 137.601448 137.601448