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Maximal bowel diameter (cm) and serum electrolytes. Correlation analyses were used to investigate the relationship between maximal bowel diameter (cm) and serum electrolytes at onset (defined as the date of radiologic diagnosis of Ogilvie's syndrome). The correlation between the 2 variables was determined using Spearman correlation coefficient for non-normal data. A correlation was found only between serum calcium levels and bowel size (r2 = 0.2347).
