condition mean min max ZT0-3 26.6413 26.6413 26.6413 ZT4-7 25.0654 25.0654 25.0654 ZT8-11 15.33985 15.33985 15.33985 ZT12-15 12.7776 12.7776 12.7776 ZT16-19 14.78835 14.78835 14.78835 ZT20-23 30.52265 30.52265 30.52265