[R-meta] About how to interpret the following P-value from the result

[英文科陳品誠]

I'm currently performing a meta-analysis on the relationship between
"Digital game-based learning" and "English vocabulary acquisition". And I'm
using the random effect model for moderator analysis since the
heterogeneity effect is quite high. The following is the code I use for
performing the moderator analysis for one moderator in my dataset, "device
used":

> mod.Device <- rma.mv(yi = y, V = v,+                        slab = studyID, data = DG,+                        random = ~ 1 | studyID/effectsizeID,+                        test = "t", method = "REML",+                        mods = ~ Device)> mod.Device

and here is the result:



Multivariate Meta-Analysis Model (k = 29; method: REML)

Variance Components:

            estim    sqrt  nlvls  fixed                factor
sigma^2.1  0.0663  0.2575     28     no               studyID
sigma^2.2  0.0000  0.0000     29     no  studyID/effectsizeID

Test for Residual Heterogeneity:
QE(df = 25) = 44.8744, p-val = 0.0086

Test of Moderators (coefficients 2:4):
F(df1 = 3, df2 = 25) = 0.8975, p-val = 0.4563

Model Results:

           estimate      se     tval  df    pval    ci.lb   ci.ub
intrcpt      0.7746  0.1008   7.6856  25  <.0001   0.5670  0.9822  ***
DeviceMD     0.0898  0.1681   0.5343  25  0.5978  -0.2564  0.4361
DeviceN/A   -0.2275  0.2338  -0.9732  25  0.3398  -0.7091  0.2540
DeviceV/A    0.2968  0.2936   1.0107  25  0.3219  -0.3080  0.9015

intrcpt    = computer

DeviceMD   = mobile devices

DeviceN/A  = not available

DeviceV/A  = VR or AR devices
---

and this is what I'm a little bit confused on. Can anyone help me clarify
whether my explanation is correct or wrong?
(1) the p-value under "*Test of moderators*" which is 0.4563, does this
mean that this moderator (device used) does not have a significant impact
on English vocabulary learning using digital game-based learning? (Since
the p-value here is larger than 0.05)
(2) the p-value of "*intrcpt*" which is <.0001, does this mean that using
computers to learn English vocabulary still has a significant difference
among the four types of devices?

陳品誠 (Nick Chen)
Email: t571 using wlgsh.tp.edu.tw <t5741 using wlgsh.tp.edu.tw>

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