condition mean min max ZT0-3 2.4563275 2.41693 2.495725 ZT4-7 1.75089 1.75089 1.75089 ZT8-11 1.714595 1.714595 1.714595 ZT12-15 0 0 0 ZT16-19 2.7717799999999997 2.7717799999999997 2.7717799999999997 ZT20-23 2.765545 2.765545 2.765545