Table 4.

Balancing Tests of Matching Covariates for the Outcome Variable (LoseWeight) ^a.

		Female				Male
U = Unmatched		Self-Reported Normal-Weight		Self-Reported Overweight		Self-Reported Normal-Weight		Self-Reported Overweight
M = Matched		Difference	p b	Difference	p b	Differenc	p b	Difference	p b
BMI category	U	1.860	0.000	0.250	0.000	1.752	0.000	0.380	0.000
	M	0.051	0.176	0.007	0.438	0.036	0.612	−0.002	0.824
Age (years)	U	0.102	0.000	0.244	0.000	0.042	0.259	0.028	0.310
	M	−0.003	0.920	−0.025	0.304	0.016	0.755	0.009	0.737
Non-Hispanic White	U	0.041	0.000	0.162	0.000	−0.014	0.368	0.071	0.000
	M	0.010	0.354	0.009	0.354	0.006	0.762	0.014	0.174
Hispanics	U	0.043	0.000	0.018	0.181	0.043	0.001	0.028	0.008
	M	−0.012	0.241	−0.008	0.391	−0.008	0.671	−0.018	0.055
African American	U	−0.094	0.000	−0.194	0.000	−0.073	0.000	−0.106	0.000
	M	0.002	0.782	0.009	0.243	0.003	0.793	0.006	0.352
GPA	U	0.157	0.000	0.122	0.000	0.242	0.000	0.280	0.000
	M	−0.012	0.556	0.028	0.136	−0.017	0.684	0.001	0.956
10th grade	U	0.000	0.985	−0.037	0.004	−0.016	0.222	−0.013	0.200
	M	0.000	0.980	−0.005	0.546	0.008	0.630	−0.004	0.647
11th grade	U	0.013	0.085	0.038	0.003	−0.001	0.951	0.003	0.784
	M	0.005	0.597	0.008	0.345	0.004	0.847	0.006	0.494
12th grade	U	0.019	0.015	0.078	0.000	0.021	0.121	0.019	0.065
	M	−0.001	0.902	−0.007	0.425	−0.003	0.882	0.001	0.884
Depression	U	0.088	0.000	0.050	0.001	0.069	0.000	0.030	0.002
	M	−0.021	0.060	0.004	0.684	−0.013	0.491	−0.009	0.290
Suicide	U	0.066	0.000	0.057	0.000	0.058	0.000	0.022	0.003
	M	−0.013	0.148	0.005	0.580	−0.005	0.747	−0.006	0.340
Sex	U	−0.018	0.038	−0.126	0.000	−0.081	0.000	−0.142	0.000
	M	0.003	0.818	0.007	0.501	0.000	0.993	−0.012	0.245
Drink	U	0.053	0.000	0.019	0.121	0.004	0.801	−0.033	0.002
	M	−0.005	0.624	−0.008	0.343	0.000	0.993	−0.016	0.102
Smoke	U	0.059	0.000	0.006	0.659	−0.024	0.113	−0.005	0.663
	M	−0.010	0.375	0.001	0.927	−0.002	0.919	−0.012	0.232
Marijuana	U	0.038	0.000	−0.051	0.000	−0.048	0.002	−0.034	0.003
	M	−0.002	0.850	0.000	0.962	0.005	0.812	−0.006	0.548
Drive	U	0.033	0.000	−0.019	0.160	−0.005	0.755	−0.016	0.137
	M	−0.008	0.446	−0.005	0.614	0.003	0.865	−0.007	0.476

^a All tests for the mean difference of each matching covariate between the comparison and treatment groups are based on the PSM with five neighbors. Let n₁ and n₂ represent the number of observations in the treatment and comparison groups on the support. The corresponding t-statistics are calculated as $\left({\overline{X}}_{treat}-{\overline{X}}_{control}\right)=\left({\overline{X}}_{treat}-{\overline{X}}_{control}\right)/\sqrt{\frac{{\sigma }_{treat}^2}{n_1}+\frac{{\sigma }_{control}^2}{n_1}}$. Figures in bold indicate the mean difference is statistically different at the 10% significance level; ^b P-value for the equal mean of each matching covariate between the treatment and comparison groups.