BMC Medical Research Methodology

Table 1 The distributions of alkaline phosphatase and serum creatinine by age and sex

From: Comparison of four algorithms on establishing continuous reference intervals for pediatric analytes with age-dependent trend

Age (years)	Alkaline phosphatase (U/L)						Serum creatinine (umol/L)
	Boys			Girls			Boys			Girls
	n	Mean	SD	n	Mean	SD	n	Mean	SD	n	Mean	SD
> = 1	255	253.96	62.55	225	243.68	50.98	260	24.85	3.52	227	23.78	3.33
2~	304	228.59	47.73	266	236.15	55.18	309	28.58	4.02	273	28.61	4.46
3~	446	222.06	45.83	337	220.36	45.17	449	32.61	4.23	328	31.08	3.50
4~	287	214.88	42.28	298	224.49	47.75	286	35.14	4.36	300	34.24	4.34
5~	286	226.13	47.68	280	233.63	47.95	289	37.18	4.32	284	36.95	4.50
6~	393	227.92	43.78	355	230.68	47.52	392	40.90	5.34	362	40.02	4.99
7~	413	231.92	52.08	372	237.97	51.65	409	41.93	4.95	378	40.93	5.02
8~	401	240.51	53.58	405	250.31	58.60	402	44.04	5.41	405	43.02	5.59
9~	396	247.88	58.34	371	261.05	64.72	386	46.33	5.14	369	45.15	5.23
10~	426	256.03	61.68	390	283.31	61.18	422	48.99	5.85	391	45.36	5.19
11~	298	283.69	75.29	287	272.87	68.94	299	49.87	6.12	293	45.75	6.25
12~	408	325.02	92.31	356	226.99	83.11	410	55.62	8.52	353	51.64	7.93
13~	283	319.35	97.79	315	178.50	68.13	282	59.66	9.65	319	53.46	8.10
14~	230	266.79	99.06	239	137.99	49.86	232	66.92	11.03	240	55.65	7.73
15~	309	178.57	80.91	383	100.32	33.80	307	75.27	10.84	375	60.77	7.39
16~	196	132.40	49.03	244	87.52	24.61	198	77.84	11.09	247	61.43	8.25
17~	162	103.91	28.26	264	74.55	18.27	164	79.58	10.25	264	61.55	7.87
18~	113	91.61	18.18	293	70.80	15.47	115	78.51	9.76	297	60.16	7.92
19–20	63	83.44	19.79	168	69.28	14.40	63	84.51	8.72	165	59.67	6.85

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ISSN: 1471-2288

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