condition mean min max ZT0-3 30.200000000000003 30.200000000000003 30.200000000000003 ZT4-7 25.8 25.8 25.8 ZT8-11 31.049999999999997 31.049999999999997 31.049999999999997 ZT12-15 42.65 42.65 42.65 ZT16-19 29.7 29.7 29.7 ZT20-23 41.05 41.05 41.05