condition mean min max ZT0-3 36.74635 36.74635 36.74635 ZT4-7 32.0563 32.0563 32.0563 ZT8-11 32.5474 32.5474 32.5474 ZT12-15 32.6191 32.6191 32.6191 ZT16-19 45.700649999999996 45.700649999999996 45.700649999999996 ZT20-23 37.57985 37.57985 37.57985