condition mean min max ZT0-3 5.6073877235 3.8474096789999996 7.367365768 ZT4-7 7.0088557555 5.591917429 8.425794082 ZT8-11 10.5996216275 9.42334917 11.775894085000001 ZT12-15 12.214485668 11.743793915000001 12.685177420999999 ZT16-19 15.92650312 15.7863209 16.06668534 ZT20-23 14.167278159999999 13.04712711 15.287429209999999