condition mean min max ZT0-3 1.6508 1.531935 1.769665 ZT4-7 1.287099 1.287099 1.287099 ZT8-11 1.053385 1.053385 1.053385 ZT12-15 0 0 0 ZT16-19 3.0334149999999998 3.0334149999999998 3.0334149999999998 ZT20-23 1.6641949999999999 1.6641949999999999 1.6641949999999999