condition mean min max ZT0-3 9.320133 9.320133 9.320133 ZT4-7 10.93872 10.93872 10.93872 ZT8-11 11.655726000000001 11.655726000000001 11.655726000000001 ZT12-15 11.4360785 11.4360785 11.4360785 ZT16-19 12.861751 12.861751 12.861751 ZT20-23 12.771138 12.771138 12.771138