condition mean min max ZT0-3 13.588884 13.588884 13.588884 ZT4-7 12.591173 12.591173 12.591173 ZT8-11 16.18433 16.18433 16.18433 ZT12-15 14.7163075 14.7163075 14.7163075 ZT16-19 13.229788 13.229788 13.229788 ZT20-23 14.914822999999998 14.914822999999998 14.914822999999998