condition mean min max ZT0-3 55.85 55.85 55.85 ZT4-7 25.4 25.4 25.4 ZT8-11 20.0 20.0 20.0 ZT12-15 40.6 40.6 40.6 ZT16-19 30.2 30.2 30.2 ZT20-23 20.700000000000003 20.700000000000003 20.700000000000003