condition mean min max ZT0-3 20.447249999999997 20.447249999999997 20.447249999999997 ZT4-7 19.041 19.041 19.041 ZT8-11 19.475 19.475 19.475 ZT12-15 14.19615 14.19615 14.19615 ZT16-19 19.93175 19.93175 19.93175 ZT20-23 16.0936 16.0936 16.0936