condition mean min max ZT0-3 1399.382135 1399.382135 1399.382135 ZT4-7 1103.816597 1103.816597 1103.816597 ZT8-11 928.2800445 928.2800445 928.2800445 ZT12-15 1024.2419075 1024.2419075 1024.2419075 ZT16-19 854.529511 854.529511 854.529511 ZT20-23 983.4634475 983.4634475 983.4634475