condition mean min max ZT0-3 1.037217 0.8758874999999999 1.1985465 ZT4-7 2.76218 2.76218 2.76218 ZT8-11 2.2958350000000003 2.2958350000000003 2.2958350000000003 ZT12-15 0 0 0 ZT16-19 1.80492 1.80492 1.80492 ZT20-23 1.7732 1.7732 1.7732