Table 3. Study participants with successful DNA target amplification and sequencing.

	Lower urinary Ca2+ excretion n = 355 (range 18–165 mg/day)		Higher urinary Ca2+ excretion n = 260 (range 210–465 mg/day)
	Stone formers n = 182	Non-stone formers n = 173	Stone formers n = 164*	Non-stone formers n = 96
Ca2+ (mg/day)	100±37	101±35	320±57	309±56
Age (years)	64±11	61±8	59±10	60±8
BMI (kg/m2)	28±6	26±5	28±5	27±5

The frequency of kidney stone formers was significantly higher (*) in the high urinary Ca²⁺ group (Chi Square P value = 0.004).