condition mean min max ZT0-3 1.3701899999999998 1.2642099999999998 1.45111 ZT4-7 1.165494 1.165494 1.165494 ZT8-11 1.29336 1.29336 1.29336 ZT12-15 2.0471675 1.857265 2.23707 ZT16-19 1.589785 1.589785 1.589785 ZT20-23 2.124785 2.124785 2.124785