condition mean min max ZT0-3 0.9896408333333333 0.41644349999999997 1.3566699999999998 ZT4-7 1.122472 1.122472 1.122472 ZT8-11 1.772875 1.772875 1.772875 ZT12-15 1.14445125 0.8180125 1.4708899999999998 ZT16-19 0.8981055 0.8981055 0.8981055 ZT20-23 1.370851 1.370851 1.370851