Table 1

Meta-regression output

Model	N	1RM (kg)					Fat-free mass (kg)
Model	N	Coeff. (95% CI)	τ²	Adj. R²	I ²	p Value	N	Coeff. (95% CI)	^τ2	Adj. R²	I ²	p Value
No covariates	28	2.49 (0.64 to 4.33)	6.05		33%	0.01	27	0.30 (0.09 to 0.52)	0.05		7%	<0.01
Univariate
Baseline protein intake	21	2.85 (-8.15 to 13.84)	7.82	1%	37%	0.59	22	0.64 (0.02 to 1.27)	0	100%	0%	0.045
Protein dose	23	0.13 (-0.04 to 0.31)	3.16	40%	0%	0.13	20	0.02 (-0.01 to 0.04)	0.09	0%	0%	0.25
Age	27	0.01 (-0.09 to 0.11)	6.51	−9%	34%	0.78	25	−0.01 (-0.02 to 0.00)	0	100%	0%	0.02
Training status	28	5.77 (-2.96 to 7.13)	5.77	5%	31%	0.40	26	0.75 (0.09 to 1.40)	0.03	49%	0%	0.03
All covariates	15		5.36	10%	0%	0.77	15		0	100%	0%	0.12
Baseline protein intake	15	6.40 (-11.62 to 24.42)				0.43	15	−0.57 (-2.50 to 1.37)				0.95
Protein dose	15	0.05 (-0.78 to 0.88)				0.70	15	−0.01 (-0.07 to 0.06)				0.99
Age	15	0.07 (-0.18 to 0.33)				0.23	15	−0.01 (-0.02 to 0.00)				0.19
Training status	15	−2.81 (-20.80 to 15.17)				0.63	15	1.19 (-1.34 to 2.19)				0.48