. 2020 Sep 24;10(10):664. doi: 10.3390/brainsci10100664

Table 5.

Summary of findings in the meta-analyses.

					Effect Size			Publication Bias			Heterogeneity
Groups		K	N	N_s	SMD	95% CI	p	Funnel Plot	Trim-and-Fill		q-Value	I ²	p
Groups		K	N	N_s	SMD	95% CI	p	Funnel Plot	Adj SMD	% of Var	q-Value	I ²	p
Overall PHD		10	816	81.6	0.530	[0.225, 0.836]	<0.001	Slight asym	0.335	37%	8.779	0%	0.458
PHD subgroups	MIG	8	669	83.7	0.369	[0.1, 0.638]	0.007	Slight asym	0.267	28%	7.481	6.5%	0.38
PHD subgroups	TTH	2	147	73.5	1.122	[0.540, 1.704]	<0.001	-	-	-	1	0%	0.317
Head position	Fixed	4	303	75.75	0.589	[0.071, 1.107]	0.026	Slight asym	0.45	23%	1.108	0%	0.7751
Head position	No fixed	6	513	85.5	0.502	[0.080, 0.923]	0.020	Sym	0.502	0%	6.483	8%	0.2620
Type SVV measure	Rod Projected	6	471	78.5	0.493	[0.081, 0.906]	0.019	Asym	0.21	53%	4.880	0%	0.4307
Type SVV measure	Bucket test	4	345	86.25	0.593	[0.097, 1.090]	0.019	Sym	0.593	0%	2.856	0%	0.4144

Abbreviations: Asym = Asymmetric; I² = degree of inconsistence; K = number of studies; N = number of participants in each meta-analysis; N_s = number of participants per study; p = p-value; Adj = adjusted; % of var = percentage of variation; PHD = primary headache disorder; SMD = standardized mean difference; TTH = tension-type headache; 95% CI = 95% confidence interval; Asym = asymmetric; Sym = symmetric.