condition mean min max ZT0-3 1861.2 1861.2 1861.2 ZT4-7 1642.4 1642.4 1642.4 ZT8-11 1554.3000000000002 1554.3000000000002 1554.3000000000002 ZT12-15 1335.15 1335.15 1335.15 ZT16-19 1684.6999999999998 1684.6999999999998 1684.6999999999998 ZT20-23 1898.5500000000002 1898.5500000000002 1898.5500000000002