Figure 8 from: Popovych Z, Rozhko M, Ostapyak I, Oktysyuk Y (2020) Biochemical indexes of mineral metabolismin patients from the polluted regionaffected by chronic periodontitis. Pharmacia 67(1): 23-28. https://doi.org/10.3897/pharmacia.67.e36150

Figure 8 Contents of Calcium (mmol/l) in oral liquid (B) in patients with chronic periodntitis. Notation.* – the difference between indexes in healthy people and those diagnosed with chronic periodontitis of I and II degree is statistically probable.