condition mean min max ZT0-3 52.0 52.0 52.0 ZT4-7 63.4 63.4 63.4 ZT8-11 79.4 79.4 79.4 ZT12-15 78.6 78.6 78.6 ZT16-19 21.85 21.85 21.85 ZT20-23 30.700000000000003 30.700000000000003 30.700000000000003