Key points are not available for this paper at this time.
Systematic uncertainties in the light-element abundances and their evolution complicate a rigorous statistical assessment. However, using Bayesian methods we show that the following statement is robust: The predicted and measured abundances are consistent with 95% credibility only if the baryon-to-photon ratio is between 2 10^-10 and 6. 5 10^-10 and the number of light neutrino species is less than 3. 9. Our analysis suggests that the ^4He abundance may have been systematically underestimated.
Copi et al. (Mon,) studied this question.