condition mean min max ZT0-3 11.380875 11.380875 11.380875 ZT4-7 16.86495 16.86495 16.86495 ZT8-11 8.60931 8.60931 8.60931 ZT12-15 2.361835 2.361835 2.361835 ZT16-19 9.81846 9.81846 9.81846 ZT20-23 11.963059999999999 11.963059999999999 11.963059999999999