condition mean min max ZT0-3 1.81718 1.81718 1.81718 ZT4-7 1.039325 1.039325 1.039325 ZT8-11 0.8391245 0.8391245 0.8391245 ZT12-15 0.918405 0.918405 0.918405 ZT16-19 2.72308 2.72308 2.72308 ZT20-23 1.8487049999999998 1.8487049999999998 1.8487049999999998