condition mean min max ZT0-3 165.608381 165.608381 165.608381 ZT4-7 255.837017 255.837017 255.837017 ZT8-11 312.53927150000004 312.53927150000004 312.53927150000004 ZT12-15 312.62163799999996 312.62163799999996 312.62163799999996 ZT16-19 236.7679635 236.7679635 236.7679635 ZT20-23 211.40028949999999 211.40028949999999 211.40028949999999