condition mean min max ZT0-3 11.917383 11.917383 11.917383 ZT4-7 10.874126 10.874126 10.874126 ZT8-11 13.1611175 13.1611175 13.1611175 ZT12-15 10.9511435 10.9511435 10.9511435 ZT16-19 12.766957999999999 12.766957999999999 12.766957999999999 ZT20-23 13.070130500000001 13.070130500000001 13.070130500000001