Table 3.

Odds ratios (95% confidence intervals) of anemia across quartiles of dietary magnesium intake stratified by age NHANES 2011–2016.

Magnesium intake (mg/d)	N (Event %)	Crude model		Model 1		Model 2
		OR (95% CI)	P value	OR (95% CI)	P value	OR (95 %CI)	P value
Age (20–44)
Q1 (<179)	134 (12.6)	1(Ref)		1(Ref)		1(Ref)
Q2 (179–239)	89 (8.6)	0.65 (0.49 ~ 0.87)	0.003	0.73 (0.54 ~ 0.98)	0.039	0.82 (0.59 ~ 1.14)	0.244
Q3 (239–304)	97 (8.5)	0.64 (0.49 ~ 0.85)	0.002	0.78 (0.58 ~ 1.05)	0.098	0.91 (0.64 ~ 1.3)	0.607
Q4 (304–395)	91 (8.3)	0.63 (0.47 ~ 0.83)	0.001	0.95 (0.7 ~ 1.29)	0.751	1.25 (0.83 ~ 1.89)	0.291
Q5 (>395)	68 (5.4)	0.39 (0.29 ~ 0.53)	<0.001	0.81 (0.58 ~ 1.12)	0.203	1.05 (0.61 ~ 1.8)	0.867
P for trend			<0.001		0.526		0.392
Age (45–60)
Q1 (<179)	77 (12.9)	1(Ref)		1(Ref)		1(Ref)
Q2 (179–239)	60 (9.5)	0.71 (0.5 ~ 1.01)	0.059	0.79 (0.55 ~ 1.15)	0.219	0.84 (0.56 ~ 1.25)	0.387
Q3 (239–304)	63 (9.8)	0.74 (0.52 ~ 1.05)	0.088	0.93 (0.64 ~ 1.34)	0.698	0.97 (0.63 ~ 1.51)	0.908
Q4 (304–395)	54 (7.4)	0.54 (0.37 ~ 0.78)	0.001	0.75 (0.52 ~ 1.11)	0.148	0.72 (0.43 ~ 1.21)	0.217
Q5 (>395)	45 (6.2)	0.44 (0.3 ~ 0.65)	<0.001	0.67 (0.44 ~ 1)	0.051	0.6 (0.3 ~ 1.19)	0.141
P for trend			<0.001		0.065		0.206
Age (>60)
Q1 (<179)	223 (21.8)	1(Ref)		1(Ref)		1(Ref)
Q2 (179–239)	152 (15.5)	0.66 (0.52 ~ 0.83)	<0.001	0.73 (0.57 ~ 0.92)	0.007	0.78 (0.59 ~ 1.02)	0.07
Q3 (239–304)	137 (14.8)	0.63 (0.49 ~ 0.79)	<0.001	0.67 (0.53 ~ 0.86)	0.001	0.74 (0.54 ~ 1.01)	0.055
Q4 (304–395)	113 (13.3)	0.55 (0.43 ~ 0.7)	<0.001	0.6 (0.46 ~ 0.77)	<0.001	0.63 (0.43 ~ 0.92)	0.017
Q5 (>395)	73 (10.4)	0.41 (0.31 ~ 0.55)	<0.001	0.42 (0.31 ~ 0.56)	<0.001	0.44 (0.26 ~ 0.75)	0.003
P for trend			<0.001		<0.001		0.005

Crude model adjusted for none. Model 1 adjusted for sex and race. Model 2 adjusted for all covariates listed in Table 1.