condition mean min max ZT0-3 0.24590183333333332 0.11206150000000001 0.33902 ZT4-7 0.081283 0.081283 0.081283 ZT8-11 0.16688 0.16688 0.16688 ZT12-15 0.72744275 0.710812 0.7440735 ZT16-19 0.6361509999999999 0.6361509999999999 0.6361509999999999 ZT20-23 0.5051255 0.5051255 0.5051255