According to regression analysis, ICAM1 genotype and BMI variables contribute statistically to association under study (Table 4); Thus, the risk (OR) of being diagnosed with GBS in people with ICAM1 GA genotype is about one‐third (33%) compared with people with ICAM1 GG genotype (95% CI: 0.11–0.99; p = .047). The gene discussed is ICAM1; the disease is Guillain-Barre syndrome.