condition mean min max ZT0-3 37.05 37.05 37.05 ZT4-7 24.8 24.8 24.8 ZT8-11 30.200000000000003 30.200000000000003 30.200000000000003 ZT12-15 42.099999999999994 42.099999999999994 42.099999999999994 ZT16-19 26.9 26.9 26.9 ZT20-23 41.6 41.6 41.6