condition mean min max ZT0-3 18.0832 11.5776 24.22205 ZT4-7 28.717750000000002 28.717750000000002 28.717750000000002 ZT8-11 17.627650000000003 17.627650000000003 17.627650000000003 ZT12-15 27.268475000000002 26.453000000000003 28.08395 ZT16-19 22.17925 22.17925 22.17925 ZT20-23 17.4699 17.4699 17.4699