condition mean min max ZT0-3 23.8043 19.34075 28.267850000000003 ZT4-7 15.40935 15.40935 15.40935 ZT8-11 16.04495 16.04495 16.04495 ZT12-15 0 0 0 ZT16-19 25.36195 25.36195 25.36195 ZT20-23 22.700899999999997 22.700899999999997 22.700899999999997