condition mean min max ZT0-3 9.0703275 8.097555 10.043099999999999 ZT4-7 5.470135 5.470135 5.470135 ZT8-11 14.64475 14.64475 14.64475 ZT12-15 0 0 0 ZT16-19 19.7473 19.7473 19.7473 ZT20-23 13.510555 13.510555 13.510555