condition mean min max ZT0-3 102.433172 102.433172 102.433172 ZT4-7 248.3934075 248.3934075 248.3934075 ZT8-11 604.07453 604.07453 604.07453 ZT12-15 833.827937 833.827937 833.827937 ZT16-19 969.3940945 969.3940945 969.3940945 ZT20-23 1213.4115065 1213.4115065 1213.4115065