condition mean min max ZT0-3 49.5721 49.5721 49.5721 ZT4-7 15.8594 15.8594 15.8594 ZT8-11 39.172799999999995 39.172799999999995 39.172799999999995 ZT12-15 88.15979999999999 88.15979999999999 88.15979999999999 ZT16-19 86.47970000000001 86.47970000000001 86.47970000000001 ZT20-23 77.87195 77.87195 77.87195