Sentence examples for derived a sample size from inspiring English sources

Calculations derived a sample size of 17 children in each group to yield 80% power (with alfa.05) in detecting a reduction of 2 point in MOPS.

Assuming the Cox proportional hazards model, Hsieh and Lavori (2000) derived a sample size formula in which the variance of a continuous variable σ satisfies where Δ is the hazard ratio associated with one unit of increase in marker values.

In deriving a sample size for patient subgroups we extrapolated from the PECARN data as it is the only CDR which differentiates between children aged less than two years and children aged two years and older [ 17].

Each equation (no. 1 12) were derived from a sample size of n = 50 randomly selected trees from five BWI plots.

Missing data were removed from the analysis as displayed in Table  2.> -wrap-foot> *This weighted n is derived from a sample size of 2745, of which 2272 (82.8%) were non-rural residents and 473 (17.2%) rural residents.

The number of animals used was derived from a sample size calculation based on historical airway function data from two previous studies using the change in PC30 (the intravenous histamine dose required to generate a 30% increase in lung resistance [RL] above baseline) induced by double antigen challenge.

Frison and Pocock[ 5] have derived a generalized sample size equation that can be used to assess power for ANCOVA where baseline measures are taken before treatment: p is the number of baseline measures; subscripts pre, post and mix refer, respectively, to the mean correlations within baseline measurements, within follow-up measurements and between baseline and follow-up measures.

Liu, Tzeng and Tsou [ 16] presented a three-step testing procedure and derived an optimal sample size allocation rule in an ethical and reliable manner that minimizes the total sample size.

Briefly, this was derived using a sample-size weighted regression analysis of two studies reporting the dynamics of CrCL during pregnancy [ 14, 15].

A trial of similar design, utilising the same duration and dose of paracetamol and with BHR testing to MCh as the primary outcome variable, based on the SD derived from this study, would require a sample size of approximately 650 to attain adequate power to detect a difference of 0.5 doubling doses.

Given the multiplicity of analyses employed in the development of a new instrument it is difficult to derive a priori sample size estimates.