Fig. 3

Subgroup and interaction analyses based on dataset A (trans-lycopene ≥ infection point). a Interaction diagram between OA and trans-lycopene; b influence of age on the relationship between OA and trans-lycopene. OA: osteoarthritis; OP: history of osteoporosis. All covariates (except for grouping variables) included in this study were adjusted in the subgroup analysis. P values were calculated via weighted GLM. Test for P for trend based on variables containing weighted median values for each weighted quartile. The P value for interactions was calculated via ANOVA