condition mean min max ZT0-3 12.3764522505 11.819761420999999 12.93314308 ZT4-7 8.25466240325 7.7234467175 8.785878089 ZT8-11 10.17974738975 8.8351780395 11.52431674 ZT12-15 6.00861384325 3.8222176735 8.195010013000001 ZT16-19 3.733520992 3.5767808225 3.8902611615000002 ZT20-23 5.64127186 4.8674417035 6.4151020165