condition mean min max ZT0-3 44.282325 39.584599999999995 48.98005 ZT4-7 32.31765 32.31765 32.31765 ZT8-11 52.24485 52.24485 52.24485 ZT12-15 0 0 0 ZT16-19 57.67175 57.67175 57.67175 ZT20-23 44.95445 44.95445 44.95445