condition mean min max ZT0-3 24.5728 24.5728 24.5728 ZT4-7 6.69928 6.69928 6.69928 ZT8-11 8.5149 8.5149 8.5149 ZT12-15 50.7633 50.7633 50.7633 ZT16-19 42.98805 42.98805 42.98805 ZT20-23 48.06075 48.06075 48.06075