Table 1

Cumulative risk of referral to a nephrologist within 12 months of initial abnormal creatinine result*

	Age group	Number	Cumulative proportion referred (%)	95% Confidence limits
*Patients previously known to the nephrology service have been excluded from the denominator.
Non-diabetic patients	20–39	307	16.6	12.2 to 21.0
	40–49	327	16.2	11.7 to 20.6
	50–59	806	14.0	11.3 to 16.6
	60–69	1746	9.6	8.1 to 11.1
	70–79	4094	6.6	5.7 to 7.4
	80+	5689	3.0	2.5 to 3.5
	Total	12969	6.5	6.0 to 7.0

Diabetic patients	20–39	74	41.7	31.5 to 51.8
	40–49	95	24.9	19.7 to 30.2
	50–59	279	26.1	20.8 to 31.5
	60–69	801	25.8	22.7 to 29.0
	70–79	1392	18.4	16.3 to 20.5
	80+	1075	9.0	7.1 to 10.9
	Total	3716	19.2	17.9 to 20.6