condition mean min max ZT0-3 23.0009 23.0009 23.0009 ZT4-7 17.0199 17.0199 17.0199 ZT8-11 11.837599999999998 11.837599999999998 11.837599999999998 ZT12-15 17.714199999999998 17.714199999999998 17.714199999999998 ZT16-19 30.2712 30.2712 30.2712 ZT20-23 25.0044 25.0044 25.0044