Additional file 2 of Maternal blood folate status during early pregnancy and occurrence of autism spectrum disorder in offspring: a study of 62 serum biomarkers

Additional file 2: Figure S2. Associations between sampling year and studied biomarkers. The smooth line was fitted with loess. a All participants. b Case group. c Control group.附加文件2：图S2。采样年份与所研究生物标志物（biomarkers）之间的关联。该平滑线采用局部加权回归散点平滑法（loess）拟合。a 全部受试者；b 病例组；c 对照组。