condition mean min max ZT0-3 17.5 17.5 17.5 ZT4-7 12.5 12.5 12.5 ZT8-11 23.450000000000003 23.450000000000003 23.450000000000003 ZT12-15 35.45 35.45 35.45 ZT16-19 16.700000000000003 16.700000000000003 16.700000000000003 ZT20-23 14.8 14.8 14.8