condition mean min max ZT0-3 22.977 22.977 22.977 ZT4-7 21.143700000000003 21.143700000000003 21.143700000000003 ZT8-11 29.95515 29.95515 29.95515 ZT12-15 34.935050000000004 34.935050000000004 34.935050000000004 ZT16-19 29.8736 29.8736 29.8736 ZT20-23 25.99595 25.99595 25.99595