condition mean min max ZT0-3 25.4811 25.4811 25.4811 ZT4-7 29.977449999999997 29.977449999999997 29.977449999999997 ZT8-11 19.42625 19.42625 19.42625 ZT12-15 16.2653 16.2653 16.2653 ZT16-19 18.210800000000003 18.210800000000003 18.210800000000003 ZT20-23 22.5265 22.5265 22.5265