Table 6 Metaregression analysis to identify sources of bias associated with study characteristics
Covariates | Coef. | Std. err. | t | P > |t| | [95 % conf. interval] | |
|---|---|---|---|---|---|---|
(a) Acquisition memory | ||||||
Quality score | −.8748308 | .2568104 | −3.41 | 0.002 | −1.400067 | −.3495946 |
sex | .6720335 | .4156478 | 1.62 | 0.117 | −.1780618 | 1.522129 |
dose | .1827889 | . 2101048 | 0.87 | 0.391 | −.2469237 | .6125015 |
special | .24532 | .1328595 | 1.85 | 0.075 | −.0264082 | .5170483 |
model | .8326842 | .7477604 | 1.11 | 0.294 | −.8588674 | 2.524236 |
(b) Retention memory | ||||||
Quality score | .4047783 | .3156139 | 1.28 | 0.224 | −.2828853 | 1.092442 |
sex | .7864006 | .291455 | 2.70 | 0.019 | 1.421426 | .1513747 |
dose | −.4543919 | .3441781 | −1.32 | 0.211 | −1.204292 | .2955078 |
special | .7864006 | .291455 | 2.70 | 0.019 | .1513747 | 1.421426 |