TABLE 3.

The list of equations that represents the system dynamics models (SDMs)

Equation					Causal link
(1)	IIBt = ImpactHBonIIB × HB+(1 − ImpactHBonIIB) × Normt				CL4; CL5
(2)	DiscrepancyBMIandIIBt = BMIt − IIBt
(3)	PALt+1 = PALt = 0+IntentPAB × DiscrepancyBMIandIIBt				CL8
(4)	TDEIt+1 = TDEIt = 0+IntentEB × DiscrepancyBMIandIIBt				CL6
(5)	TDEEt+1 = BMRt × PALt+1				CL9; CL12
(6)	$W_{t+1}=W_t+\left({\mathit{\text{Rate}}}_{\mathit{\text{Weight gain}}}-{\mathit{\text{Rate}}}_{\mathit{\text{Weight loss}}}\right)=W_t+\left(\frac{{\mathit{\text{TMEI}}}_{t+1}}{7700}-\frac{{\mathit{\text{TMEE}}}_{t+1}}{7700}\right)=W_t+\left(\frac{{\mathit{\text{TDEI}}}_{t+1}}{7700}\times \frac{365}{12}-\frac{{\mathit{\text{TDEE}}}_{t+1}}{7700}\times \frac{365}{12}\right)=W_t+\left(\frac{73\times {\mathit{\text{TDEI}}}_{t+1}}{18480}-\frac{73\times {\mathit{\text{TDEE}}}_{t+1}}{18480}\right)$				CL7; CL10
(7)	${\mathit{BMI}}_{t+1}=\frac{W_{t+1}}{{H_{t=0}}^2}$
(8)	BMRt+1	Men	Aget = 0 18–30	BMRt+1 = 15.057 × Wt+1+692.2	CL11
			Aget = 0 30–60	BMRt+1 = 11.472 × Wt+1+873.1
			Aget = 0 ≥60	BMRt+1 = 11.711 × Wt+1+587.7
		Women	Aget = 0 18–30	BMRt+1 = 14.818 × Wt+1+486.6
			Aget = 0 30–60	BMRt+1 = 8.126 × Wt+1+845.6
			Aget = 0 ≥60	BMRt+1 = 9.082 × Wt+1+658.5
(9)	MedBMIt+1 = Median(BMIt+1)				CL1
(10)	${\mathit{\text{Norm}}}_{t+1}=\frac{{\mathit{\text{MedianBMI}}}_{t+1}+{\mathit{\text{SCIB}}}_{t=0}}{2}$				CL2; CL3

Note: We show how the equations are connected to the causal links as specified in the causal loop diagram (CLD) (Figure 3) on the right.