how many or can you use two ORs for different disease can you combine two odds ratios and the same control group combining ors with the same control group what is the difference between an OR and a control? can I combine ors and control groups to test for the disease? which is a problem when you combine an or and the control can you combine two ores with the same control group can ORs be combined with a control group can you combine two or three in a meta study can you combine an or of two with the same control population can you combine the OR in multiple studies is combining two ors a problem of observational studies how to combine ors in an observational study can you combine two ors how to calculate OR for two independent studies on a disease how to combine ors can you combining different control groups how to combine ors in studies what is the ratio for combining ORs with a random control group for an observational study of infectious diseases