. 2020 Oct 2;11:567484. doi: 10.3389/fpsyg.2020.567484

TABLE 2.

Equations of each estimated model.

Model		Equation
M.0	Intercept only	y_ij = (β₀ + b_0i) + ε_ij

M.1	Intercept model with covariates	y_ij = (β₀ + b_0i) + β₁(sex_i) + β₂(experience with COVID19_i) + ε_ij

M.2	Linear model with covariates	y_ij = (β₀ + b_0i) + β₁(week of quarantine_ij) + β₂(sex_i) + β₃(experience with COVID19_i) + β₄(week of quarantine_ij * sex_i)
		+ β₅(week of quarantine_ij * experience with COVID19_i) + ε_ij

M.3	Quadratic model with linear covariates interactions	$y_{ij} = (β_{0} + b_{0 i}) + β_{1} (w e e k o f q u a r a n t i n e_{ij}) + β_{2} (w e e k o f q u a r a n t i n e_{ij}^{2}) + β_{3} (s e x_{i}) + β_{4} (e x p e r i e n c e w i t h C O V I D 19_{i})$
		+ β₅(week of quarantine_ij * sex_i) + β₆(week of quarantine_ij * experience with COVID19_i) + ε_ij

M4	Quadratic model with all covariates interactions	$y_{ij} = (β_{0} + b_{0 i}) + β_{1} (w e e k o f q u a r a n t i n e_{ij}) + β_{2} (w e e k o f q u a r a n t i n e_{ij}^{2}) + β_{3} (s e x_{i}) + β_{4} (e x p e r i e n c e w i t h C O V I D 19_{i})$
		+ β₅(week of quarantine_ij * sex_i) + β₆(week of quarantine_ij * experience with COVID19_i)
		$+ β_{7} (w e e k o f q u a r a n t i n e_{ij}^{2} * s e x_{i}) + β_{8} (w e e k o f q u a r a n t i n e_{ij}^{2} * e x p e r i e n c e w i t h C O V I D 19_{i}) + ε_{ij}$