Probiotic supplementation decreases intestinal transit time: Meta-analysis of randomized controlled trials

Table 4 Meta-regression of study- and subject-related factors on intestinal transit time

Variable	Unit of measure	Intercept	Point estimate	Explained variance	P-value
Constipation	0 = no, 1 = yes	0.171	0.415	39%	0.01
Age	Per 10 years	-0.445	0.230	27%	0.03
Female gender proportion	Per 10%	0.024	0.053	23%	< 0.05
Body mass index1	Per 5 kg/m2	-0.544	0.200	25%	0.11
Daily probiotic dosage	Per 10 × 109 cfu	0.454	-0.013	1%	0.62
Treatment duration	Per 1 wk	0.535	-0.048	1%	0.67

¹Body mass index not reported for 5 treatment effects.