condition mean min max ZT0-3 1.1355251666666666 0.0 2.31303 ZT4-7 0.146664 0.146664 0.146664 ZT8-11 0.3084535 0.3084535 0.3084535 ZT12-15 0.4699055 0.4508205 0.4889905 ZT16-19 1.1667665 1.1667665 1.1667665 ZT20-23 1.8152 1.8152 1.8152