condition mean min max ZT0-3 4.9840675 4.421125 5.54701 ZT4-7 5.37288 5.37288 5.37288 ZT8-11 9.37352 9.37352 9.37352 ZT12-15 0 0 0 ZT16-19 10.89805 10.89805 10.89805 ZT20-23 7.502125 7.502125 7.502125