Table 2.

Markov chain Monte Carlo (MCMC) posterior estimations and credible intervals (89% and 95%) for sleep efficiency among global, cross-cultural populations. 'Industrial' is the reference category for society scale. Positive coefficients indicate greater sleep efficiency, while negative coefficients indicate lesser sleep efficiency. The model includes a multilevel structure, with country of the study population modelled as a random intercept to account for group-level variability. Column for '% negative' represents the proportion of posterior samples in each direction, and also highlights level of support with strong support designated at >95%.