condition mean min max ZT0-3 7.7990075 7.67769 7.920325 ZT4-7 5.21768 5.21768 5.21768 ZT8-11 5.329135 5.329135 5.329135 ZT12-15 0 0 0 ZT16-19 14.2569 14.2569 14.2569 ZT20-23 13.2922 13.2922 13.2922