condition mean min max ZT0-3 1.26167275 1.1156505 1.407695 ZT4-7 1.3620364999999999 1.3620364999999999 1.3620364999999999 ZT8-11 1.69162 1.69162 1.69162 ZT12-15 0 0 0 ZT16-19 1.82117 1.82117 1.82117 ZT20-23 1.50931 1.50931 1.50931