GH1 and attention deficit-hyperactivity disorder: This negative association between somatotropin treatment and SARS-CoV-2 positivity remained significant and independent after adjustment for several known factors, which may be associated both with the exposure (somatotropin treatment due to GHI) and the outcome (SARS-CoV-2 infection), such as age, gender, low SES, diagnosis of diabetes mellitus, diagnosis of asthma, diagnosis of ADHD, obesity, and low plasma vitamin D3 level.