Models examined interaction of study period (ie, China National Stroke Registry [CNSR] III vs I) with the association of demographic characteristics, risk factors, and treatments with 12-month stroke recurrence. To convert milligrams per deciliter to millimoles per liter, multiply by 0.0259. LDL-C indicates low-density lipoprotein cholesterol; NIHSS, National Institutes of Health Stroke Scale; OR, odds ratio.
aTest for interaction terms of study period and each covariate in the whole analysis set combined data from CNSR I and III.