condition mean min max ZT0-3 2.9452350000000003 2.9452350000000003 2.9452350000000003 ZT4-7 3.429605 3.429605 3.429605 ZT8-11 14.803650000000001 14.803650000000001 14.803650000000001 ZT12-15 6.97215 6.97215 6.97215 ZT16-19 5.553735 5.553735 5.553735 ZT20-23 3.230245 3.230245 3.230245