condition mean min max ZT0-3 16.705199999999998 16.705199999999998 16.705199999999998 ZT4-7 15.0075 15.0075 15.0075 ZT8-11 10.3276 10.3276 10.3276 ZT12-15 8.012464999999999 8.012464999999999 8.012464999999999 ZT16-19 12.6142 12.6142 12.6142 ZT20-23 14.89585 14.89585 14.89585