condition mean min max ZT0-3 0.5121863333333334 0.5121863333333334 0.5121863333333334 ZT4-7 0.663769 0.663769 0.663769 ZT8-11 0.41198049999999997 0.41198049999999997 0.41198049999999997 ZT12-15 0.3937335 0.3937335 0.3937335 ZT16-19 0.60003 0.60003 0.60003 ZT20-23 0.432336 0.432336 0.432336