Relationship between β-amyloid protein 1-42, thyroid hormone levels and the risk of cognitive impairment after ischemic stroke

Table 2 Difference of biochemical indexes in two groups at different time points

Variable group	1st week	3rd month	6th month	1st year
Aβ1-42 in pg/mL
PSCI, n = 72	363.0 ± 37.8	356.1 ± 37.5	360.7 ± 32.2	372.5 ± 38.6
Non-PSCI, n = 116	402.2 ± 35.3	404.8 ± 32.6	411.4 ± 36.5	428.1 ± 40.9
T3 in nmol/L
PSCI, n = 72	1.23 ± 0.59	1.17 ± 0.62	1.38 ± 0.55	1.45 ± 0.67
Non-PSCI, n = 116	1.47 ± 0.77	1.49 ± 0.85	1.46 ± 0.72	1.52 ± 0.64
FT4 in pmol/L
PSCI, n = 72	13.03 ± 2.26	13.15 ± 2.14	13.79 ± 1.57	14.28 ± 2.19
Non-PSCI, n = 116)	16.47 ± 3.84	16.23 ± 3.21	16.58 ± 4.04	17.67 ± 3.18

Data are presented as mean ± standard deviation. Aβ1-42: F_{Between groups} = 4.782, P_{Between groups} = 0.011; T3: F_{Between groups} = 6.069, P_{Between groups} < 0.001; FT₄: F_{Between groups} = 1.724, P_{Between groups} = 0.195. PSCI: Post stroke cognitive impairment; Aβ1-42: β-amyloid protein1-42; T₃: Triiodothyronine; FT₄: Free thyroxin.