condition mean min max ZT0-3 25.034771 25.034771 25.034771 ZT4-7 27.5946885 27.5946885 27.5946885 ZT8-11 25.863153500000003 25.863153500000003 25.863153500000003 ZT12-15 22.96378 22.96378 22.96378 ZT16-19 23.9793695 23.9793695 23.9793695 ZT20-23 25.3862405 25.3862405 25.3862405