Contemporary meta-analysis of short-term probiotic consumption on gastrointestinal transit

Table 6 Meta-regression of study- and subject-related factors on intestinal transit time

Variable	Unit of measure	Intercept	Point estimate	Explained variance (%)	P value
Constipation/IBS-C	1 = Yes; 0 = No	0.218	0.352	38	< 0.01
Jadad score	Per 1 unit	-0.117	0.141	31	0.01
Age	Per 1 yr	-0.352	0.021	27	0.02
Female gender proportion	Per 10%	-0.045	0.055	26	0.02
Number of probiotic strains	Per 1 strain	0.618	-0.133	20	< 0.05
Body mass index1	Per 1 kg/m2	-0.526	0.037	22	0.08
Treatment duration	Per 1 d	0.392	-0.004	0	0.96
Daily probiotic dosage	Per 10 × 109 CFU	0.385	-0.001	0	0.98

¹Body mass index not reported for 5 treatment effects. Variables sorted from greatest to least explained variance.