condition mean min max ZT0-3 854.366684 854.366684 854.366684 ZT4-7 671.4448474999999 671.4448474999999 671.4448474999999 ZT8-11 546.9382175 546.9382175 546.9382175 ZT12-15 407.0945295 407.0945295 407.0945295 ZT16-19 335.584743 335.584743 335.584743 ZT20-23 303.5418645 303.5418645 303.5418645