Summary of literature search for reference ranges of CSF glucose, CSF/plasma glucose ratio and CSF lactate.

N - number of CSF samples included in study; wk(s) – week(s); dys – days; yrs- years; P – percentile.N：本研究纳入的脑脊液（Cerebrospinal Fluid, CSF）样本数量；wk(s) —— 周（week的单复数形式，括号内的s为可选后缀）；dys —— 天（day的复数形式缩写）；yrs —— 年（year的复数形式缩写）；P —— 百分位数。