condition mean min max ZT0-3 2.213425 2.213425 2.213425 ZT4-7 2.38946 2.38946 2.38946 ZT8-11 2.52465 2.52465 2.52465 ZT12-15 0.8769115000000001 0.8769115000000001 0.8769115000000001 ZT16-19 2.07373 2.07373 2.07373 ZT20-23 1.49294 1.49294 1.49294