condition mean min max ZT0-3 13.64725 11.8152 15.4793 ZT4-7 13.45785 13.45785 13.45785 ZT8-11 9.451425 9.451425 9.451425 ZT12-15 0 0 0 ZT16-19 14.7025 14.7025 14.7025 ZT20-23 15.9895 15.9895 15.9895