condition mean min max ZT0-3 9.192792 9.192792 9.192792 ZT4-7 11.240896 11.240896 11.240896 ZT8-11 9.9059055 9.9059055 9.9059055 ZT12-15 10.14349 10.14349 10.14349 ZT16-19 12.571667000000001 12.571667000000001 12.571667000000001 ZT20-23 10.087466500000001 10.087466500000001 10.087466500000001