Figure 1.8 is from a crosssectional study to determine the incidence of pregnancyrelated venous thromboembolic events and their relationship to selected risk factors, such as maternal age, parity,...

Figure 1.8 is from a cross‐sectional study to determine the incidence of pregnancy‐related venous thromboembolic events and their relationship to selected risk factors, such as maternal age, parity, smoking, and so on. Identify the type of each variable in the table.