condition mean min max ZT0-3 2.06156 1.5202849999999999 2.602835 ZT4-7 0.8691285 0.8691285 0.8691285 ZT8-11 0.903167 0.903167 0.903167 ZT12-15 0 0 0 ZT16-19 1.21424 1.21424 1.21424 ZT20-23 1.0874000000000001 1.0874000000000001 1.0874000000000001