condition mean min max ZT0-3 0.6519913333333334 0.6519913333333334 0.6519913333333334 ZT4-7 0.635861 0.635861 0.635861 ZT8-11 0.3347275 0.3347275 0.3347275 ZT12-15 0.8232165 0.8232165 0.8232165 ZT16-19 1.138485 1.138485 1.138485 ZT20-23 0.880796 0.880796 0.880796