condition mean min max ZT0-3 6.106476002499999 1.460340785 10.752611219999999 ZT4-7 23.4571485175 21.217711455 25.696585579999997 ZT8-11 8.447524336499999 6.6031772765 10.2918713965 ZT12-15 19.05456856675 12.7393367285 25.369800405 ZT16-19 52.096433715 37.877752885 66.315114545 ZT20-23 137.4852049375 99.889946025 175.08046385