Cox proportional hazards model showing effect of IgG levels on risk of having a clinical malaria episode from 6–18 months post-vaccination.

Only the univariate model is shown.aHazard Ratio is the proportional effect on the hazard per doubling of antibody levels.bConfidence Interval. cSignificant in step-wise multivariate model (adjusted by vaccination group, age, previous clinical malaria cases and baseline immunofluorescence antibody test titers); VSA = Variant surface antigen.

仅展示单变量模型（univariate model）。
a 风险比（Hazard Ratio）：抗体水平每翻倍时对风险率的比例效应。
b 置信区间（Confidence Interval）。
c 在逐步多变量模型中具有统计学显著性（该模型已按疫苗接种组别、年龄、既往临床疟疾发作史以及基线免疫荧光抗体检测滴度进行校正）；VSA（Variant surface antigen）= 变异表面抗原。