Table 6.

Age-based thresholds used to define low nephron number per kidney based on a combined sample (N=1240 donors and N=327 patients with tumor) after excluding those with diabetes, hypertension, family history of ESKD, 24 hours urine protein >500 mg/d, eGFR <60 ml/min per 1.73 m² for age <60 years, and eGFR <45 ml/min per 1.73 m² for age ≥60 years

Age (yr)	Male					Female
	n	5th Percentiles		10th Percentiles		n	5th Percentiles		10th Percentiles
		Threshold	n (%) Abnormal	Threshold	n (%) Abnormal		Threshold	n (%) Abnormal	Threshold	n (%) Abnormal
18–39	198	<832,551	10 (5.1)	<868,983	20 (10.1)	257	<597,963	13 (5.1)	<718,571	26 (10.1)
40–49	162	<685,956	9 (5.6)	<765,753	17 (10.5)	276	<574,069	14 (5.1)	<688,871	28 (10.1)
50–59	162	<681,376	9 (5.6)	<739,822	17 (10.5)	229	<542,527	12 (5.2)	<658,520	23 (10.0)
60–69	91	<621,889	5 (5.5)	<672,435	9 (9.9)	112	<483,515	6 (5.4)	<539,805	12 (10.7)
70+	49	<553,210	3 (6.1)	<575,894	5 (10.2)	31	<430,338	2 (6.5)	<483,885	4 (12.9)