condition mean min max ZT0-3 1.4729174999999999 1.188925 1.75691 ZT4-7 2.3866 2.3866 2.3866 ZT8-11 2.7850200000000003 2.7850200000000003 2.7850200000000003 ZT12-15 0 0 0 ZT16-19 2.33805 2.33805 2.33805 ZT20-23 4.071525 4.071525 4.071525