Barely Significant

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The interaction effect was close to significance in the case of happiness; appealing differences were observed between males and females: while there was a slight decrease in happiness as BMI increased in men (7.5 vs. 7.3 units for overweight and obesity, respectively), the difference was 1.6 units between women with overweight (7.9 units) and those with obesity (6.3 units). 3.3.
Given these significant findings from this subset of studies, and the fact that the effect becomes non-significant (albeit almost significant in the PPP analysis) as more studies become included, this suggests that perhaps either the variability added by the inclusion of more studies reduces any potential “real” effect of the music intervention, or that the musical intervention does not in fact exert a true effect.
Note that reference groups among variables are set to those with the highest fatality rates: accidents that have occurred in “demolition” projects, those where source of injury was a “vehicle,” and those wherein the cause was “fencing, installing lights, signs, etc.” From the 14 coefficients, six (excluding the constant) are significant at the level of 0.05, and three are marginally significant at the 0.10 significance level.