condition mean min max ZT0-3 31.700000000000003 31.700000000000003 31.700000000000003 ZT4-7 60.4 60.4 60.4 ZT8-11 29.650000000000002 29.650000000000002 29.650000000000002 ZT12-15 40.8 40.8 40.8 ZT16-19 46.45 46.45 46.45 ZT20-23 34.3 34.3 34.3