Table 1.

Demographic characteristics of the study population.

Phenotype	TwinsUK		QBB
n	4,863		2,807
Female, n (%)	4513 (92.8%)		1,398 (49.8%)
	Mean	SD	Mean	SD	P
Age, yrs	53.46	13.2	39.11	12.0	8.06 × 10−14
BMI, kg/m2	26.15	4.9	28.92	5.9	3.88 × 10−4
SBP, mmHg	127.42	18	114.6	15.2	1.59 × 10−7
DBP, mmHg	77.24	10.1	73.29	10.5	7.29 × 10−3
Creatinine, µmolL	73.24	22.06	67.67	19.7	0.06
Macronutrient intake*:
Energy, Kj	7991.46	2316
Carbohydrates, g	238.91	77.4
Protein, g	80.37	22.9
Total fat, g	68.01	25
Electrolytes:
Chloride, mmol/L	103	3.19	101.1	2.16	1.89 × 10−6
Sodium, mmol/L	140.61	2.38	140.3	2.19	0.34
Potassium, mmol/L	4.16	0.32	4.32	0.32	5.07 × 10−4
Bicarbonate, mmol/L	25.52	2.45	26.39	2.02	6.73 × 10−3
Calcium, mmol/L	2.37	0.1	2.39	0.092	0.14
Phosphate, mmol/L	1.11	0.16	1.14	0.171	0.20

*Prior to adjustments for energy intake.