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Estimated weight and height of critically ill patients: how reliable are these values in acutely admitted patients?
Critical Care volume 9, Article number: P253 (2005)
Patients' weight (W) and height values (H) are often unknown on acute admittance to the ICU. In the present study we investigated: (a) whether estimated W&H are in agreement with W&H values given by patients/relatives, and estimated H is in agreement with measured H; and (b) whether body mass index (BMI) and H influence estimated W&H values.
One hundred consecutive acutely admitted patients (from whom pre-admission W&H were unknown) were included. W&H were recorded from medical/nurse ICU records ('estimated W&H'). Afterwards, patients or close relatives were asked for pre-admission W&H ('actual W&H'). In addition, H was determined with a tape measure ('measured H'). Patients were divided into four BMI (calculated from actual W and measured H) groups and four height groups. The mean difference was calculated to assess bias between both methods. Ranges of 95% limits of agreement were calculated to assess agreement between both methods for individual patients. Statistics were by regression analysis.
(a) The mean difference (95% confidence interval) between actual and measured H was 0.9 (0.3–1.4) cm. The mean difference between estimated and measured H was 1.0 (-0.2 to 2.3) cm. The 95% limits of agreement were -4.6 to 6.4 cm and -10.1 to 12.2 cm, respectively. The mean difference between estimated and actual W was 1.8 (0.7–2.9) kg. The 95% limits of agreement were -9.3 to 12.9 kg. (b) See Table 1 for data of agreement between estimated and actual W for BMI subgroups. See Table 2 for data of agreement between estimated and measured H for height subgroups.
Estimated W&H match actual W and measured H of acutely admitted ICU patients very well. W estimation is more variable for the highest BMI group.
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Determann, R., Wolthuis, E., Vroom, M. et al. Estimated weight and height of critically ill patients: how reliable are these values in acutely admitted patients?. Crit Care 9, P253 (2005). https://doi.org/10.1186/cc3316
- Public Health
- Confidence Interval
- Body Mass Index
- Regression Analysis
- Emergency Medicine