condition mean min max ZT0-3 6.423195 6.423195 6.423195 ZT4-7 7.949630000000001 7.949630000000001 7.949630000000001 ZT8-11 3.840715 3.840715 3.840715 ZT12-15 4.86159 4.86159 4.86159 ZT16-19 7.053515 7.053515 7.053515 ZT20-23 6.734325 6.734325 6.734325