Table 3.

Mediation effects between NDVI and arthritis, Annual relative humidity, annual precipitation and metabolic equivalent as mediators

Mediator	ADE (95%CI)	ACME (95%CI)	Total effect (95%CI)	Proportion mediated
Annual precipitation	3.37e-02 (1.14e-02, 6.00e-02) **	1.89e-03 (4.70e-04, 1.00e-02) **	3.56e-02 (1.30e-02, 6.00e-02) **	5.31e-02 **
Annual relative humidity	3.71e-02 (1.54e-02, 6.00e-02) **	-1.53e-03 (-3.83e-03, 0.00)	3.56e-02 (1.44e-02, 6.00e-02) **	-4.30e-02
Metabolic equivalent	3.48e-02 (1.51e-02, 6.00e-02) ***	8.80e-04 (-6.20e-04, 1.00e-02)	3.57e-02 (1.55e-02, 6.00e-02) ***	2.46e-02

ADE   Average Direct Effect ACME   Average Causal Mediation Effect 

All models adjusted for gender, age, BMI, residence, marital status, education level, smoking status, drinking status, and cooking fuel use 

Values are presented in scientific notation with three significant figures

** P- value < 0.01

*** P- value < 0.001