POSTN and stroke disorder: The increase in periostin levels observed during the first 6 days was correlated with National Institutes of Health Stroke Scale (NIHSS) scores on both day 1 (r = 0.219, p = 0.011, Fig. 2A) and day 6 (r = 0.291, p = 0.001, Fig. 2B), but not with stroke volume (r = −0.026, p = 0.771).