nominally significantP < 0.05
The mediating effects of three body fat indexes ( BMI, WHR and body fat percentage ), which were nominally significant in both models ( P < 0.05), were further evaluated for nature indirect effects ( NIE ) and nature direct effects ( NDE ) on the impact of age on diabetes oncome by VanderWeele's mediation approach 25 , 26 , 27 as follows: M B o d y _ f a t _ i n d e x e s = β 0 + β A g e ⋅ A g e + B ⋅ C o v a r i a