Moreover, Bland–Altman plots further showed a negative trend of mean biases across the level of sodium excretion, with the only exception being the Mage formula; in other words, compared with the average measured value, seven estimates were systematically biased with overestimation at lower levels and underestimation at higher levels.
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Validity of predictive equations for 24-h urinary sodium excretion at the population and individual levels among Chinese adults aged 18-69 years.
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