condition mean min max ZT0-3 0.11896871274999998 0.035850707999999995 0.20208671749999998 ZT4-7 0.5901154115 0.553016449 0.627214374 ZT8-11 0.39580964475 0.348202645 0.4434166445 ZT12-15 3.1530833537500005 1.5470642755 4.759102432000001 ZT16-19 5.4404422 4.9292815690000005 5.951602831 ZT20-23 6.59212850175 6.2717895835 6.91246742