condition mean min max ZT0-3 63.68295 63.68295 63.68295 ZT4-7 51.20005 51.20005 51.20005 ZT8-11 40.24065 40.24065 40.24065 ZT12-15 55.393 55.393 55.393 ZT16-19 60.2067 60.2067 60.2067 ZT20-23 60.6209 60.6209 60.6209