condition mean min max ZT0-3 4.713845 4.713845 4.713845 ZT4-7 2.854735 2.854735 2.854735 ZT8-11 3.48639 3.48639 3.48639 ZT12-15 5.88602 5.88602 5.88602 ZT16-19 8.211925 8.211925 8.211925 ZT20-23 7.440185 7.440185 7.440185