Table 2.

Mixed-effect model testing BMI category and weight perception as predictors of Math grades ≥60% among youth

	Females (N = 31,334)		Males (N = 30,552)
	AOR	95% CI	AOR	95% CI
BMI Category (Reference: “Normal weight”)
Obesity	0.70**	0.59–0.82	0.62**	0.55–0.71
Overweight	0.90	0.80–1.02	0.87*	0.79–0.97
Underweight	0.93	0.70–1.25	0.85	0.68–1.07
Missing weight data	0.56**	0.51–0.61	0.62**	0.57–0.68
Missing sex, age, or height data	0.64**	0.55–0.74	0.65**	0.57–0.74
Weight Perception (Reference: “About the right weight”)
Overweight	0.82**	0.75–0.89	0.91	0.83–1.00
Underweight	0.77**	0.69–0.86	0.90*	0.82–0.97
Missing weight perception	0.64**	0.50–0.83	0.59**	0.47–0.73
Race/ethnicity (Reference: White)
Nonwhite, multiethnic, or other	0.92	0.85–1.00	0.87**	0.81–0.94
Grade (Reference: 9)
10	0.82**	0.74–0.90	0.80**	0.73–0.88
11	0.96	0.87–1.07	0.83**	0.75–0.91
12	0.91	0.81–1.02	0.88	0.79–0.99
Othera	1.10	0.95–1.26	1.14	0.99–1.31
Weekly Spending Money (Reference: None)
$1–$20	0.94	0.84–1.05	0.93	0.84–1.02
$21–$100	0.94	0.84–1.05	0.89	0.80–0.99
> $100	0.94	0.83–1.07	0.86*	0.77–0.95
Don’t know	1.05	0.93–1.19	1.02	0.91–1.14

Note: Cross-sectional data from Year 6 (2017/2018) of the COMPASS study (N = 61,886). The outcome reference category is math grades < 60%. Mixed models were used to account for school clustering by adding a random intercept at the school level

*p < .01

**p < .001

^aSecondary I-II in Quebec schools