condition mean min max ZT0-3 69.825462 69.825462 69.825462 ZT4-7 77.39556999999999 77.39556999999999 77.39556999999999 ZT8-11 69.1980715 69.1980715 69.1980715 ZT12-15 64.591996 64.591996 64.591996 ZT16-19 67.08215 67.08215 67.08215 ZT20-23 55.7113755 55.7113755 55.7113755