condition mean min max ZT0-3 2229.65 2229.65 2229.65 ZT4-7 1666.0 1666.0 1666.0 ZT8-11 1567.4 1567.4 1567.4 ZT12-15 1470.65 1470.65 1470.65 ZT16-19 1819.8000000000002 1819.8000000000002 1819.8000000000002 ZT20-23 2066.7 2066.7 2066.7