relative sensitivity was estimated for eight exposure factors : antibiotic or antifungal drug use ( rs = 1.2 ) , urinary tract or yeast infection ( rs = 2.7 ) , history of infertility ( rs = 1.4 ) , use of birth control after conception ( rs = 7.6 ) , elective abortion history ( rs = 1.1 ) , any over-the-counter drug use ( rs = 1.0 ) , spotting or bleeding ( rs = 1.2 ) , and nausea or vomiting ( rs = 0.8 ) these data suggest the presence of recall bias for some exposure factors .
C0025874
spotting
C0019080
bleeding