condition mean min max ZT0-3 5.718015 4.46598 7.07727 ZT4-7 1.83182 1.83182 1.83182 ZT8-11 3.313195 3.313195 3.313195 ZT12-15 6.5598399999999994 5.73041 7.38927 ZT16-19 5.486924999999999 5.486924999999999 5.486924999999999 ZT20-23 5.819015 5.819015 5.819015