condition mean min max ZT0-3 0.297508278 0.10564854800000001 0.489368008 ZT4-7 1.2111437375 0.963455715 1.45883176 ZT8-11 2.01278507225 1.6464537639999999 2.3791163805 ZT12-15 5.72816711975 3.1336733845 8.322660855 ZT16-19 9.433616725 7.0805186849999995 11.786714765 ZT20-23 18.01593551 16.3937165 19.63815452