Table 2.

The Danish (n = 200) linear regression equations for each subtest used for PHES calculation. The data were all log-transformed to achieve normal distribution, except for the LTT errors, which were square root transformed, and the SDT, which was log-log transformed. The data demonstrates the impact of age, sex, and education on each subtest

Subtest	Constant	Age	Sex	Education	Standard deviation of residuals	Interpretation
			Female vs male	13–19 years vs others
NCTA	2.63	0.015	-0.123	-0.214	0.373	NCT A time increases with age Females are faster than males People with longer education are faster
NCTB	3.61	0.014	-0.129	-0.224	0.266	NCT B time increases with age Females are faster than males People with longer education are faster
LTT time	3.84	0.007	0	-0.134	0.309	LTT time increases with age There is no effect of sex People with longer education are faster
LTT error	3.25	0.039	0	0	1.963	LT errors increase with age There is no effect sex and education
DSTa	4.13	-0.007	0.123	0.136	0.167	Fewer boxes are filled with increasing age Females and people with longer education fill more boxes
SDT	1.25	0.002	0	- 0.041b - 0.054	0.053	SDT time increases with age There is no effect of sex People with longer education are faster

Abbreviations: Portosystemic Hepatic Encephalopathy Score (PHES), Number Connection Test A (NCT-A), Number Connection Test B (NCT-B), Line Tracing Test time (LTT time), Line Tracing Test errors (LTT errors), Digit Symbol Test (DST), Serial Dotting Test (SDT)

^aOperational sign is opposite the other subtests because DST is better the higher it gets (boxes filled)

^b10–12 years versus others