condition mean min max ZT0-3 4.359095 4.359095 4.359095 ZT4-7 3.81294 3.81294 3.81294 ZT8-11 3.252595 3.252595 3.252595 ZT12-15 3.29575 3.29575 3.29575 ZT16-19 3.95357 3.95357 3.95357 ZT20-23 5.01257 5.01257 5.01257