condition mean min max ZT0-3 27.8 27.8 27.8 ZT4-7 28.2 28.2 28.2 ZT8-11 15.9 15.9 15.9 ZT12-15 14.3 14.3 14.3 ZT16-19 18.700000000000003 18.700000000000003 18.700000000000003 ZT20-23 14.1 14.1 14.1