condition mean min max ZT0-3 79.414553 79.414553 79.414553 ZT4-7 50.849203 50.849203 50.849203 ZT8-11 46.20402300000001 46.20402300000001 46.20402300000001 ZT12-15 55.266943999999995 55.266943999999995 55.266943999999995 ZT16-19 30.316370999999997 30.316370999999997 30.316370999999997 ZT20-23 40.465276 40.465276 40.465276