condition mean min max ZT0-3 86.3 86.3 86.3 ZT4-7 2.8 2.8 2.8 ZT8-11 24.700000000000003 24.700000000000003 24.700000000000003 ZT12-15 22.3 22.3 22.3 ZT16-19 39.8 39.8 39.8 ZT20-23 43.1 43.1 43.1