condition mean min max ZT0-3 41.8 41.8 41.8 ZT4-7 40.2 40.2 40.2 ZT8-11 29.950000000000003 29.950000000000003 29.950000000000003 ZT12-15 41.55 41.55 41.55 ZT16-19 31.700000000000003 31.700000000000003 31.700000000000003 ZT20-23 34.85 34.85 34.85