Table 2. Association of subclinical thyroid status and various cognitive performance tests at baseline.

	Thyroid status			p-value for difference
Cognitive test	Subclinical hyperthyroidism N = 65	EuthyroidismN = 4,928	Subclinical hypothyroidism N = 161	Subclinical hyperthyroidism vs. euthyroidism	Subclinical hypothyroidism vs. euthyroidism
MMSE, score	28.04 (0.19)	28.04 (0.03)	27.87 (0.12)	0.97	0.15
Stroop, seconds	65.61 (3.07)	65.34 (0.46)	65.90 (2.02)	0.93	0.78
LDCT, digits coded	24.31 (0.86)	23.63 (0.13)	23.51 (0.54)	0.42	0.79
PLTi, pictures remembered	9.29 (0.23)	9.45 (0.03)	9.72 (0.14)	0.50	0.06
PLTd, pictures remembered	10.31 (0.32)	10.30 (0.05)	10.65 (0.20)	0.97	0.09

Abbreviations: MMSE, Mini-Mental State Examination; LDCT, Letter-Digit Coding Test; PLTi, Picture-Word Learning Test immediate; PLTd, Picture-Word Learning Test delayed. Cognitive tests were presented in mean (standard error). Associations were assessed by linear regression analyses, adjusted for sex, age, education, country, apo E genotype and test version where appropriate.