Table 1 Subject characteristics, physical activity levels, breath gas concentrations, faecal pH and SCFA concentrations in LN and OWOB participants^a

	LN (n=52)	OWOB (n=42)	P-value
Age, years	32.0±1.8	37.9±2.0	0.03
Gender, male:female	22:30	21:21	0.46
Ethnicity, A:C:B:H%	44:50:2:4	31:55:12:2	0.18
BMI, kg m⁻²	21.8±0.3	30.3±0.7	—
Physical activity, MET hours per week	13.7±2.5	13.6±3.2	0.97
Breath hydrogen, p.p.m.	6.0±1.2	6.3±1.0	0.65^b
Breath methane, p.p.m.	10.8±3.3	4.4±1.7	0.01^b
Faecal pH	6.6±0.1	6.6±0.1	0.27
AC, mmol kg⁻¹ wet weight	41.4±2.6	48.0±2.3	0.05^b
PR, mmol kg⁻¹ wet weight	15.1±1.1	17.6±1.2	0.03^b
Iso-BU, mmol kg⁻¹ wet weight	2.2±0.2	2.3±0.3	0.19^b
BU, mmol kg⁻¹ wet weight	14.0±1.3	16.1±1.0	0.05^b
Iso-VA, mmol kg⁻¹ wet weight	2.9±0.2	3.0±0.4	0.29^b
VA, mmol kg⁻¹ wet weight	2.0±0.2	2.5±0.3	0.03^b
Total SCFA, mmol kg⁻¹ wet weight	77.6±4.5	89.7±4.2	0.02^b

Abbreviations: A, Asian; AC, acetate; B, Black; BMI, body mass index; BU, butyrate; C, Caucasian; H, Hispanic; LN, lean; MET, metabolic equivalents; OWOB, overweight/obese; PR, propionate; SCFA, short chain fatty acids; VA, valerate.
^aValues are means±s.e.m.
^bAge-adjusted P-values.

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