Table 2.

Mean values, reference ranges, and percentiles of urinary calcium creatinine ratio according to age group

Age (yr)	No.	Mean	SD	Range	95% CI	5th	50th	95th	97.5th
5–7*	21	0.0571	0.0344	0.008–0.137	0.0414–0.0728	0.009	0.0506	0.133	0.137
8	38	0.0618	0.0404	0.002–0.142	0.0485–0.0751	0.005	0.0606	0.141	0.142
9	48	0.0529	0.0373	0.007–0.178	0.0421–0.0638	0.007	0.0507	0.111	0.163
10	50	0.0623	0.0379	0.006–0.143	0.0518–0.0727	0.008	0.0580	0.139	0.143
11	56	0.0465	0.0304	0.002–0.131	0.0384–0.0547	0.008	0.0381	0.101	0.130
12	79	0.0518	0.0362	0.002–0.147	0.0435–0.0601	0.007	0.0422	0.125	0.146
13	71	0.0482	0.0349	0.002–0.182	0.0399–0.0453	0.009	0.0389	0.126	0.145
14	43	0.0475	0.0372	0.002–0.185	0.0361–0.0590	0.009	0.0359	0.144	0.181
15	25	0.0480	0.0363	0.003–0.115	0.0330–0.0630	0.008	0.0394	0.144	0.145
16	21	0.0601	0.0498	0.012–0.212	0.0374–0.0828	0.013	0.0422	0.203	0.212
>16–18†	21	0.0597	0.0360	0.004–0.135	0.0433–0.0762	0.005	0.0595	0.134	0.138
Total	473	0.0530	0.0368	0.002–0.212	0.0497–0.0564	0.008	0.0453	0.126	0.142

SD, standard deviation; CI, confidence interval.

^*Because of the small number of subjects (1) in age group 6, numbers are combined with age groups 5–7 years.

^†Because of the small number of subjects (6) in age group 17–18 years, numbers are combined with age group 16–18 years.