condition mean min max ZT0-3 1.1140903333333334 1.1140903333333334 1.1140903333333334 ZT4-7 0.9955045 0.9955045 0.9955045 ZT8-11 0.5853315 0.5853315 0.5853315 ZT12-15 0.7831684999999999 0.7831684999999999 0.7831684999999999 ZT16-19 1.0535349999999999 1.0535349999999999 1.0535349999999999 ZT20-23 0.7751950000000001 0.7751950000000001 0.7751950000000001