condition mean min max ZT0-3 17.659361 17.659361 17.659361 ZT4-7 32.138547 32.138547 32.138547 ZT8-11 58.1529615 58.1529615 58.1529615 ZT12-15 32.0891765 32.0891765 32.0891765 ZT16-19 53.2415995 53.2415995 53.2415995 ZT20-23 40.236592 40.236592 40.236592