📘 epidemiology

1. **Problem statement:** We have a cohort study involving emotional support as exposure and PTSD symptoms as outcome for the first table, and PTSD symptoms as exposure and death b

1. Problem 1a: Measure and interpret association between number of births and cataract. 2. Set up a 2x2 table for each birth category comparing cases and controls to calculate odds

1. **State the problem:** We want to find the basic reproduction number $R_0$ for the system given by:

1. **State the problem:** We want to find the basic reproduction number $R_0$ for the system without using the Next Generation Matrix (NGM) method, given the differential equations