condition mean min max ZT0-3 3.8378750000000004 3.8378750000000004 3.8378750000000004 ZT4-7 3.1171800000000003 3.1171800000000003 3.1171800000000003 ZT8-11 3.00964 3.00964 3.00964 ZT12-15 3.283155 3.283155 3.283155 ZT16-19 4.716715000000001 4.716715000000001 4.716715000000001 ZT20-23 4.186165000000001 4.186165000000001 4.186165000000001