condition mean min max ZT0-3 78.23896666666667 74.64555 83.80449999999999 ZT4-7 70.5 70.5 70.5 ZT8-11 83.88425000000001 83.88425000000001 83.88425000000001 ZT12-15 84.4208 75.80369999999999 93.03790000000001 ZT16-19 75.97235 75.97235 75.97235 ZT20-23 74.5969 74.5969 74.5969