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It is negative and marginally significant in the corresponding fixed effects model (not reported).
The results for random effects 2SLS model in columns 4 1 and 4 2 are similar to those without fixed effects, and so are those from a fixed effect model (not reported), although the effect of permanent stays negative but becomes statistically insignificant.
Also, when maternal BMI was forcibly added into the multivariable model (not reported here), the observed associations did not attenuate.
In a separate post hoc model not reported in the tables, we used the middle two quartiles as the reference category in a polytomous regression model.
More recently, a study [ 47] examined associations of the FF assay with mortality and demonstrated that a higher admission contribution of FF to MA predicted lower mortality (unadjusted hazard ratio, 0.815; P <0.001; 95% CI and adjusted model not reported).
Results from the random effects error components model (not reported here) confirm that the variance partition coefficient: σ v /(σ v 2 + σ u ), is approximately zero, implying that the proportion of residual variance attributable to respondent-specific effects is also approximately zero [ 37].
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However, possible effects of sex and age were controlled in separate models (not reported) and no significant effects of either variable were found.
The results of the aforementioned models (not reported) showed that adsorption kinetic was not wholly controlled by the intra-particle diffusion or by the liquid film mass transfer diffusion.
We started the estimation of the trade models on the country data (non-zero flows only) by estimating a gravity model without fixed or random effects, using ordinary least squares estimation, and then moved on to estimate fixed effects models (both models not reported here for the sake of space) with fixed effects referring to the destination countries.
The Sargan test in the last line of the table is insignificant for both specifications, indicating that our instruments are valid and, therefore, the HT-estimates should be preferred over the ones of the FE-model (not reported in the table).
Results of these models (not reported here) supported the results with pain as a continuous predictor.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com