Table 3.

Subgroup analyses of the association between BMI categories and nutrition literacy.

Factor	NL	p a	FNL	p a	INL	p a	CNL	p a
	High vs. Low		High vs. Low		High vs. Low		High vs. Low
Gender
Boy	0.85 (0.78–0.92)**	0.333	0.82 (0.75–0.90) **	0.857	0.94 (0.87–1.03)	0.639	0.95 (0.87–1.03)	0.332
Girl	0.90 (0.83–0.98)*		0.81 (0.74–0.88) **		0.95 (0.88–1.04)		1.02 (0.93–1.11)
Grade
Junior high school	0.93 (0.86–1.01)	0.009	0.83 (0.76–0.90) **	0.379	1.02 (0.94–1.10)	0.003	1.02 (0.94–1.10)	0.163
Senior high school	0.78 (0.71–0.86)**		0.77 (0.70–0.85) **		0.85 (0.77–0.93) **		0.93 (0.85–1.02)
Ethnicity
Han	0.87 (0.82–0.93)**	0.937	0.80 (0.75–0.85) **	0.436	0.93 (0.87–0.99) *	0.198	0.98 (0.92–1.04)	0.652
Minority	0.87 (0.71–1.05)		0.88 (0.71–1.08)		1.05 (0.88–1.27)		1.02 (0.85–1.21)
Boarding school
No	0.87 (0.79–0.97) *	0.958	0.80 (0.72–0.88) **	0.660	1.03 (0.93–1.14)	0.061	0.95 (0.86–1.05)	0.393
Yes	0.87 (0.81–0.94)		0.81 (0.75–0.88) **		0.90 (0.84–0.97) **		1.00 (0.93–1.08)
Residence
Urban	0.87 (0.80–0.95) *	0.989	0.82 (0.75–0.90) **	0.706	0.95 (0.87–1.04)	0.945	0.97 (0.89–1.06)	0.801
Rural	0.87 (0.79–0.94) **		0.79 (0.73–0.87) **		0.94 (0.86–1.02)		0.99 (0.91–1.07)
Primary caregiver
Parents	0.85 (0.79–0.91) **	0.349	0.79 (0.74–0.85) **	0.663	0.91 (0.85–0.98) **	0.098	1.01 (0.90–1.04)	0.486
Others	0.92 (0.82–1.02)		0.83 (0.74–0.93) *		1.04 (0.93–1.16)		0.97 (0.90–1.13)

Model adjusted for gender, grade, ethnicity, primary caregiver, parent's education, boarding school, and residence.

^ap for interaction.

^*p < 0.05,

^**p < 0.01.