condition mean min max ZT0-3 0.9275123333333334 0.7313160000000001 1.06766 ZT4-7 0.9291555 0.9291555 0.9291555 ZT8-11 1.5133655 1.5133655 1.5133655 ZT12-15 2.8573475000000004 2.723965 2.99073 ZT16-19 2.095175 2.095175 2.095175 ZT20-23 1.8707500000000001 1.8707500000000001 1.8707500000000001