condition mean min max ZT0-3 1636.3 1636.3 1636.3 ZT4-7 1310.8 1310.8 1310.8 ZT8-11 1313.3000000000002 1313.3000000000002 1313.3000000000002 ZT12-15 1426.2 1426.2 1426.2 ZT16-19 1576.85 1576.85 1576.85 ZT20-23 1711.1 1711.1 1711.1