condition mean min max ZT0-3 0.4247416666666667 0.0663375 1.0737045 ZT4-7 1.128165 1.128165 1.128165 ZT8-11 0.733572 0.733572 0.733572 ZT12-15 1.2099202500000001 1.0833905000000001 1.3364500000000001 ZT16-19 0.790435 0.790435 0.790435 ZT20-23 0.17781799999999998 0.17781799999999998 0.17781799999999998