condition mean min max ZT0-3 1.7816100000000001 1.7816100000000001 1.7816100000000001 ZT4-7 1.0372805 1.0372805 1.0372805 ZT8-11 1.268875 1.268875 1.268875 ZT12-15 1.0878565 1.0878565 1.0878565 ZT16-19 1.70615 1.70615 1.70615 ZT20-23 2.384325 2.384325 2.384325