Table 1 Regression results of standardized coefficients for roommates’ commensality and average scores

	Short term: first semester		Short term: second semester		Sustained
	β	95% CI	β	95% CI	β	95% CI
Roommates’ commensality	0.092***	[0.004, 0.008]	0.142***	[0.016, 0.026]	0.104***	[0.006, 0.014]
College entrance exam scores	0.062**	[0.085, 0.576]	0.019	[-0.146, 0.448]	0.046*	[0.056, 0.660]
Political status	−0.052**	[−1.283, −0.299]	-0.037*	[−1.565, −0.106]	-0.034	[−1.543, 0.017]
Class leader experience	0.003	[−0.268, 0.326]	0.027	[−0.069, 0.793]	0.021	[−0.203, 0.744]
Gender	0.119***	[0.792, 1.535]	0.051**	[0.235, 1.249]	0.066**	[0.408, 1.504]
Constant	***		***		***
	20.95		17.71		15.93
N	2782		3355		2782
r2_a	0.251		0.148		0.145

The second row for each variable shows the t-values, and the third row shows the 95% confidence interval. The reported values in the table are standardized coefficients. Due to the conversion involving standard deviations, the values may fall outside the confidence interval. The model includes dummy variables for student origin (SO_dummy) and class (C_dummy). For simplicity, detailed coefficients are omitted. The model controls for variables other than college entrance exam scores, political status, previous class leadership experience, and gender, as well as various characteristics of the roommates, such as their college entrance exam scores and previous class leadership experience, which are also omitted from the table.
*p < 0.05, **p < 0.01, ***p < 0.001.

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