condition mean min max ZT0-3 818.95 818.95 818.95 ZT4-7 687.4 687.4 687.4 ZT8-11 723.1 723.1 723.1 ZT12-15 813.7 813.7 813.7 ZT16-19 785.9000000000001 785.9000000000001 785.9000000000001 ZT20-23 772.2 772.2 772.2