Table 4.

Results of the univariable analyses for covariates for R2* by field strength. For continuous and ordinal variables with more than two categories, Spearman’s rho was calculated, while for binary variables, the Wilcoxon-Mann-Whitney test was utilized.

Covariate	1.5T		3T
	Spearman’s rho	p-value	Spearman’s rho	p-value
Mean baseline liver PDFF	0.81	<0.001*	0.73	<0.001
Age	−0.14	0.20	−0.09	0.35
Gender	NA	0.08	NA	0.41
Weight	−0.11	0.30	−0.12	0.21
BMI Z-score	0.12	0.27	0.04	0.64
Systolic blood pressure	0.002	0.98	0.02	0.85
Diastolic blood pressure	0.01	0.92	0.11	0.24
Platelet count	0.05	0.67	0.07	0.44
Glycosylated hemoglobin	−0.07	0.52	−0.06	0.49
Aspartate aminotransferase	0.09	0.39	0.11	0.25
Alanine aminotransferase	0.25	<0.02*	0.17	0.07
Gamma-glutamyl transferase	0.01	0.91	0.10	0.29
Total bilirubin	0.04	0.71	−0.05	0.61
Serum triglycerides	0.07	0.49	0.15	0.10
Total cholesterol	0.06	0.57	0.14	0.15
Fasting blood glucose	0.10	0.36	−0.02	0.85
Insulin	−0.11	0.32	0.01	0.89
Log-transformed ferritin	0.32	<0.005*	0.23	<0.02*
Steatosis grade	0.57	<0.001*	0.53	<0.001*
Steatosis location (acinar)	NA	0.44	NA	0.33
Steatosis location (azonal/periportal)	NA	<0.05*	NA	<0.05*
Steatosis location (panacinar)	NA	<0.05*	NA	<0.01*
Hepatocyte ballooning score	−0.17	0.11	−0.26	<0.01*
Lobular inflammation score	−0.18	0.09	0.11	0.23
Portal inflammation score	−0.11	0.29	0.08	0.40
NAFLD activity score	0.14	0.19	0.18	<0.05*
Fibrosis stage	−0.18	0.09	−0.05	0.57
Lipid droplet size	NA	0.57	NA	<0.001
Glycogenosis	0.02	0.88	−0.02	0.87
Hepatocellular iron grade	NA	0.13	NA	0.10
Non-hepatocellular iron grade	NA	0.20	NA	0.05

^*Statistically significant, without correction for multiple comparisons