condition mean min max ZT0-3 26.4985942925 20.4514503 32.545738285 ZT4-7 32.718073217500006 30.131928005 35.304218430000006 ZT8-11 25.0716900275 22.86411341 27.279266645 ZT12-15 6.47314558325 2.5554273485000003 10.390863818 ZT16-19 2.3601172405 2.183527487 2.536706994 ZT20-23 1.23032474 0.830309813 1.630339667