condition mean min max ZT0-3 6.1926 4.60295 7.804449999999999 ZT4-7 4.76834 4.76834 4.76834 ZT8-11 4.524065 4.524065 4.524065 ZT12-15 6.0077425 5.724825 6.29066 ZT16-19 3.98923 3.98923 3.98923 ZT20-23 8.017965 8.017965 8.017965