condition mean min max ZT0-3 1.3855650000000002 1.3855650000000002 1.3855650000000002 ZT4-7 1.512115 1.512115 1.512115 ZT8-11 1.65952 1.65952 1.65952 ZT12-15 0.52184 0.52184 0.52184 ZT16-19 2.46563 2.46563 2.46563 ZT20-23 1.47817 1.47817 1.47817