condition mean min max ZT0-3 1.1972209999999999 1.125192 1.26925 ZT4-7 1.83008 1.83008 1.83008 ZT8-11 1.3925100000000001 1.3925100000000001 1.3925100000000001 ZT12-15 0 0 0 ZT16-19 1.7391800000000002 1.7391800000000002 1.7391800000000002 ZT20-23 2.01307 2.01307 2.01307