condition mean min max ZT0-3 1.404305 1.404305 1.404305 ZT4-7 0.7754705 0.7754705 0.7754705 ZT8-11 1.0508790000000001 1.0508790000000001 1.0508790000000001 ZT12-15 1.4329450000000001 1.4329450000000001 1.4329450000000001 ZT16-19 2.4562850000000003 2.4562850000000003 2.4562850000000003 ZT20-23 1.545925 1.545925 1.545925