condition mean min max ZT0-3 18.212243333333333 9.15938 24.641150000000003 ZT4-7 9.88106 9.88106 9.88106 ZT8-11 14.34975 14.34975 14.34975 ZT12-15 24.089075 23.748 24.43015 ZT16-19 25.56335 25.56335 25.56335 ZT20-23 28.658749999999998 28.658749999999998 28.658749999999998