condition mean min max ZT0-3 16.67975 16.67975 16.67975 ZT4-7 11.869299999999999 11.869299999999999 11.869299999999999 ZT8-11 9.956075 9.956075 9.956075 ZT12-15 11.25685 11.25685 11.25685 ZT16-19 16.353749999999998 16.353749999999998 16.353749999999998 ZT20-23 17.09185 17.09185 17.09185