文獻中“Statistical analysis”中寫到:Palmitoleate concentrations were evaluated in sex-specific quintiles as indicator variables andcontinuously per 1-SD difference.
上圖注釋部分寫到Values are multivariable-adjusted linear regression coefficients for a 1-SD difference in palmitoleic acid concentrations as a percentage of fatty acids,
問題如下:
1. 文獻里 1-SD difference是什么意思。
2.如何做呢?我看文獻中用線性回歸來做,脂肪酸的濃度是因變量,自變量是什么呢?比如Age,each 5 y這個變量,是不是把年齡按照(如35-40,40-45,45-50)這樣的形式分成多組,作為自變量,然后線性回歸分析?Age,each 5 y后面那個0.05(0.00,0.09)是什么呀?