Table 3. Sex- and age-adjusted effects and corresponding 95% confidence intervals (95% CI) on body mass index (BMI) in linear regression models of the joint effects of tertiles of a BMI-associated genetic risk score (GRS_BMI) and socioeconomic position indicators, calculated separately for income quartiles and education categories, with the group of having a low genetic risk score and the highest socioeconomic position as reference.

Income Quartiles
	n	ß (95% CI)	p
Lower Quartile
High GRSBMI	175	0.19 (-0.51; 0.89)	0.59
Middle GRSBMI	170	-0.70 (-1.38; -0.02)	0.05
Low GRSBMI	167	-0.65 (-1.33; 0.03)	0.06
2nd Quartile
High GRSBMI	827	0.98 (0.33; 1.62)	<0.01
Middle GRSBMI	849	0.31 (-0.35; 0.97)	0.35
Low GRSBMI	810	-0.37 (-1.04; 0.29)	0.27
3rd Quartile
High GRSBMI	333	1.24 (0.57; 1.91)	<0.01
Middle GRSBMI	329	-0.08 (-0.75; 0.58)	0.81
Low GRSBMI	343	-0.30 (-0.96; 0.37)	0.38
Highest Quartile
High GRSBMI	135	1.77 (1.10; 2.44)	2.0*10−7
Middle GRSBMI	172	0.69 (0.03; 1.34)	0.04
Low GRSBMI	172	Ref. -	-
Education Groups
	n	ß (95% CI)	p
≤ 10 years
High GRSBMI	295	4.54 (3.57; 5.51)	<2.0*10−16
Middle GRSBMI	320	2.72 (1.74; 3.69)	4.6*10−8
Low GRSBMI	332	1.62 (0.64; 2.59)	<0.01
11–13 years
High GRSBMI	404	2.68 (1.93; 3.43)	2.2*10−12
Middle GRSBMI	366	1.80 (1.06; 2.55)	2.2*10−6
Low GRSBMI	355	1.18 (0.43; 1.93)	<0.01
14–17 years
High GRSBMI	340	1.99 (1.15; 2.82)	3.2*10−6
Middle GRSBMI	355	1.10 (0.26; 1.93)	0.01
Low GRSBMI	354	1.39 (0.56; 2.22)	<0.01
≥ 18 years
High GRSBMI	351	0.76 (-0.26; 1.78)	0.14
Middle GRSBMI	381	0.02 (-0.93; 0.98)	0.96
Low GRSBMI	361	Ref.-	-