condition mean min max ZT0-3 2174.95 2174.95 2174.95 ZT4-7 1569.5 1569.5 1569.5 ZT8-11 1639.4499999999998 1639.4499999999998 1639.4499999999998 ZT12-15 1619.15 1619.15 1619.15 ZT16-19 1726.4499999999998 1726.4499999999998 1726.4499999999998 ZT20-23 1953.3 1953.3 1953.3