condition mean min max ZT0-3 2.7191124999999996 2.343685 3.09454 ZT4-7 3.329345 3.329345 3.329345 ZT8-11 6.44489 6.44489 6.44489 ZT12-15 0 0 0 ZT16-19 5.772685 5.772685 5.772685 ZT20-23 4.544874999999999 4.544874999999999 4.544874999999999