condition mean min max ZT0-3 412.79625 347.956 477.63649999999996 ZT4-7 968.3135 968.3135 968.3135 ZT8-11 426.1925 426.1925 426.1925 ZT12-15 0 0 0 ZT16-19 719.5405000000001 719.5405000000001 719.5405000000001 ZT20-23 877.9695 877.9695 877.9695