condition mean min max ZT0-3 85.23755 85.23755 85.23755 ZT4-7 77.90955 77.90955 77.90955 ZT8-11 55.44845 55.44845 55.44845 ZT12-15 56.7334 56.7334 56.7334 ZT16-19 63.29445 63.29445 63.29445 ZT20-23 80.07405 80.07405 80.07405