Table 3a shows that the odds of prehypertension among women with anaemia (Hb < 10.5 g/dL) at ± 22 weeks’ gestation were three times (odds ratio [OR]: 3.01, 95% confidence interval [CI]: 1.22, 7.42) higher than the odds among women without anaemia as indicated in model 2. The gene discussed is GSTM1; the disease is anemia (phenotype).