The plotted results of univariate multipoint linkage analyses are shown in Figure 1 for the older and younger datasets for Quantity × Frequency and for its component parts, Quantity and Frequency. Linkage is also shown for truncated samples, in which increasing proportions of lighter drinkers were dropped, resulting in samples of approximately 90%, 80%, and 60% of the full sample. Linkage peaks with LOD scores greater than 1.5 are reported in Table 2.
