condition mean min max ZT0-3 0.33306183333333333 0.2849935 0.41552849999999997 ZT4-7 0.3976855 0.3976855 0.3976855 ZT8-11 0.4108395 0.4108395 0.4108395 ZT12-15 0.93403875 0.740251 1.1278265 ZT16-19 0.6271804999999999 0.6271804999999999 0.6271804999999999 ZT20-23 0.7042349999999999 0.7042349999999999 0.7042349999999999