Table 5 Weighted association of recent tobacco smoking, household/confined space secondhand smoke exposure and depressive symptom in NHANES 2013–18 adults aged 18–35 years.

Predictors	b	SE	Wald	P	OR (95% CI)
Recent tobacco smoking
Model I^c	0.703	0.078	81.788	< 0.001	2.201 (1.735–2.353)
Model II^d	0.644	0.082	61.437	< 0.001	1.904 (1.621–2.237)
Model III^f	0.547	0.095	33.438	< 0.001	1.728 (1.436–2.080)
Model IV^g	0.466	0.097	23.167	< 0.001	1.593 (1.318–1.926)
Household secondhand smoke exposure
Model I^c	0.539	0.076	50.963	< 0.001	1.715 (1.479–1.989)
Model II^d	0.447	0.079	31.768	< 0.001	1.339 (1.339–1.827)
Model III^e	0.190	0.092	4.268	0.038	1.209 (1.010–1.448)
Model IV^g	0.124	0.094	1.760	0.185	1.132 (0.942–1.360)
Confined space secondhand smoke exposure
Model I^c	0.594	0.075	63.328	< 0.001	1.812 (1.565–2.097)
Model II^d	0.515	0.078	43.162	< 0.001	1.674 (1.435–1.952)
Model III^e	0.356	0.083	18.261	< 0.001	1.427 (1.212–1.680)
Model IV^f	0.336	0.085	15.730	< 0.001	1.399 (1.185–1.651)

^cOriginal model without adjusting for any variables.
^dAdjusting for covariates.
^eAdjusting for variables in the last model plus recent tobacco smoking.
^fAdjusting for variables in the last model plus household secondhand smoke exposure.
^gAdjusting for variables in the last model plus confined space secondhand smoke exposure; Same as below.

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