Elucidating the association between regional variation in diagnostic frequency with risk-adjusted mortality through analysis of claims data of medicare inpatients: a cross-sectional study.

But for people with 1, 2 or 3 chronic conditions, we found either no statistically significant trend for mortality across quintiles of diagnostic frequency, or the trends were inconsistent for different years (eg, people with three chronic conditions show a negative trend in 2009, while a positive trend in 2014).

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For beneficiaries with no chronic conditions, there was an increasing trend of mortality with increasing coding frequency, but for beneficiaries with 1, 2 or 3 chronic conditions, there was no monotonous trend for mortality ranging from the first to the fifth diagnostic frequency quintiles by observation ( figure 3 ).

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For the entire population, there was a significant trend for increasing mortality from the lowest diagnostic frequency quintile to the highest diagnostic frequency quintile (0.147, 0.164, 0.166, 0.164 and 0.174, respectively, p<0.001).

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