condition mean min max ZT0-3 481.274561 481.274561 481.274561 ZT4-7 357.991615 357.991615 357.991615 ZT8-11 382.957998 382.957998 382.957998 ZT12-15 446.3088745 446.3088745 446.3088745 ZT16-19 487.7225895 487.7225895 487.7225895 ZT20-23 509.7921285 509.7921285 509.7921285