condition mean min max ZT0-3 12.928574999999999 12.7447 13.112449999999999 ZT4-7 10.736 10.736 10.736 ZT8-11 11.34385 11.34385 11.34385 ZT12-15 0 0 0 ZT16-19 11.9999 11.9999 11.9999 ZT20-23 12.52735 12.52735 12.52735