condition mean min max ZT0-3 27.39025 27.39025 27.39025 ZT4-7 22.3437 22.3437 22.3437 ZT8-11 18.0474 18.0474 18.0474 ZT12-15 18.528 18.528 18.528 ZT16-19 33.2598 33.2598 33.2598 ZT20-23 19.1772 19.1772 19.1772