Fig. 1. Conjoint distribution of responses to questions concerning consumption of tofu asked at the 1965–1968 and 1971–1974 interviews among 3734 HAAS participants tested with the Cognitive Abilities Screening Instrument at the 1991–1993 examination. Each participant is categorized as low-low (low intake at both times), low (<twice weekly at the 1965 interview, no information or only one serving in the prior week at the 1971 interview), high (2+ servings per week at either interview), or high-high (2+ servings per week at both interviews).