condition mean min max ZT0-3 12.091175 11.3947 12.78765 ZT4-7 22.934150000000002 22.934150000000002 22.934150000000002 ZT8-11 20.7303 20.7303 20.7303 ZT12-15 0 0 0 ZT16-19 16.2834 16.2834 16.2834 ZT20-23 16.6984 16.6984 16.6984