condition mean min max ZT0-3 33.240009 33.240009 33.240009 ZT4-7 30.978714500000002 30.978714500000002 30.978714500000002 ZT8-11 24.0040265 24.0040265 24.0040265 ZT12-15 24.4001125 24.4001125 24.4001125 ZT16-19 23.3978745 23.3978745 23.3978745 ZT20-23 26.300157499999997 26.300157499999997 26.300157499999997