Table 4.

Comparison of etiology between age categories

Etiology	Age <50 years n (%)	Age ≥ 50 years n (%)
Diabetic nephropathy*	11 (19)	26 (41.3)
Hypertension	6 (10.3)	10 (15.9)
Interstitial disease	1 (1.7)	2 (3.2)
Glomerulonephritis	9 (15.5)	3 (4.8)
Obstructive uropathy	2 (3.4)	8 (12.8)
Adult polycystic kidney disease	2 (3.4)	5 (7.9)
Unknown**	26 (44.8)	5 (7.9)
Others	1 (1.7)	4 (6.4)
Total	58 (100)	63 (100)

^*Diabetic nephropathy, χ = 7.077, df = 1, P < 0.01

^**Unknown, χ = 21.567, df = 1, P < 0.001