condition mean min max ZT0-3 76.6747329375 70.00738031 83.34208556499999 ZT4-7 66.63501496500001 65.87913189666668 67.39089803333333 ZT8-11 75.58855252833334 74.08587920666668 77.09122585 ZT12-15 86.133319275 73.73833238 98.52830617000001 ZT16-19 99.01877147833333 97.53692522 100.50061773666667 ZT20-23 115.95729091666666 108.61079120000001 123.30379063333334