Introduction: Weight and height are necessary and essential measurements for the identification
and treatment of patients with malnutrition or nutritional risk. However, there are clinical situations
that prevent these measurements from being taken. The equations proposed for estimation
have been established and validated in other countries. The present study aims to determine the
most appropriate equation for Peruvian adult patients. Methods: Comparative, observational,
prospective and cross-sectional study, which included adult patients of the medicine unit of the
Hospital General Jaén. The anthropometric measurements collected were selected according to
the Chumlea and Rabito equations. Bland Altman analysis and Intraclass Correlation Coefficient
(ICC) were used to evaluate the concordance. The quality of the estimation was evaluated by the
Root Mean Square Error (RMSE) and the Mean Relative Error (ERM) methods. Statistical significance
was considered at a value of p<0.05. Results: A total of 41 patients were included, with a mean
age of 34.49 ± 12.55 years. Out of all patients, 63.41% were women. The mean weight was
63,65 ± 10.29 kg, and for height 158.70 ± 8.45 cm. The Rabito equation presented closer limits
of agreement (-7.06 to 6.83 cm), better concordance (ICC=0.908) and better quality adjustment
(RMSE=3.501; ERM=2.231) with the real height, when compared to the Chumlea equation.
In relation to the estimated weight, the Rabito equation obtained closer limits of agreement
(-7.33 to 10.84 kg), better agreement (ICC=0.882) and better quality adjustment (RMSE=4.902;
ERM=7.353) with the real measurement, compared to the Chumlea equation. Conclusion: The
Rabito equation shows closer limits of agreement, higher level of concordance and better quality
of estimation for weight and height in hospitalized Peruvian adults, observing variation in the
estimation of weight for individuals with subscapular skinfold over 30 mm.