condition mean min max ZT0-3 308.455822 308.455822 308.455822 ZT4-7 269.108625 269.108625 269.108625 ZT8-11 243.068672 243.068672 243.068672 ZT12-15 252.81785100000002 252.81785100000002 252.81785100000002 ZT16-19 227.178516 227.178516 227.178516 ZT20-23 209.135714 209.135714 209.135714