condition mean min max ZT0-3 2.3428500000000003 2.2330750000000004 2.4526250000000003 ZT4-7 2.717215 2.717215 2.717215 ZT8-11 2.07831 2.07831 2.07831 ZT12-15 0 0 0 ZT16-19 2.3006149999999996 2.3006149999999996 2.3006149999999996 ZT20-23 2.611225 2.611225 2.611225