condition mean min max ZT0-3 0.41473400000000005 0.41473400000000005 0.41473400000000005 ZT4-7 0.271308 0.271308 0.271308 ZT8-11 0.337874 0.337874 0.337874 ZT12-15 0.4377165 0.4377165 0.4377165 ZT16-19 0.328584 0.328584 0.328584 ZT20-23 0.2802225 0.2802225 0.2802225