condition mean min max ZT0-3 19.084075 15.5211 22.64705 ZT4-7 14.1191 14.1191 14.1191 ZT8-11 8.6257 8.6257 8.6257 ZT12-15 0 0 0 ZT16-19 9.458639999999999 9.458639999999999 9.458639999999999 ZT20-23 9.771455 9.771455 9.771455