Table 1.

Goodness of fit of Rosinger et al. with various water intake stratifications used in previous publications. Cells contain R² values obtained from regression models built from the published model. Top row is the replicated model from Rosinger et al.; all other rows use same dataset and same model as Rosinger et al., but with the altered stratification of a single variable (water intake). Some stratifications showed an improved goodness of fit (R² greater than Rosinger et al.); some stratifications showed a degraded goodness of fit (R² less than Rosinger et al.). All models showed a generally weak model fit (R² < 0.15).

	Norm.	OWt	Obese	All	Strata (Water Intake (mL/day))
Rosinger, 2016 [3]	0.111	0.110	0.107	0.095	<2700 (F), <3700 (M), <3800 (Lactating F)
Armstrong, 2012 [32]	0.132	0.109	0.114	0.101	{0, 1507, 1745, 2109, 2507, 2945, 3407, ∞}
Armstrong, 2010 [33]	0.132	0.110	0.113	0.100	{0, 1382, 2008, 2048, 2453, 2614, 3261, ∞}
Johnson, 2015 [34]	0.127	0.108	0.107	0.099	{0, 1620, 3210, ∞}
Muñoz, 2015 [35]	0.126	0.106	0.111	0.099	{0, 1500, 2250, 3130, ∞}
Sontrop, 2013 [19]	0.114	0.109	0.112	0.097	{0, 2000, 4300}
Pross, 2014 [36]	0.101	0.095	0.093	0.084	{0, 1200, 2000, ∞}
Perrier, 2013 [37,38]	0.107	0.099	0.103	0.080	{0, 1200; 2000, 4000} 1
Roussel, 2011 [1]	0.080	0.086	0.094	0.077	{0, 500, 1000, ∞}

Norm = Normal Weight; OWt = Overweight. Strata defined or inspired by recent studies in hydration inquiry. ¹ Middle hydration group (1200–2000 mL/d) and extremely hydrated (>4000 mL/d) censored.