Indirect determination of serum creatinine reference intervals in a Pakistani pediatric population using big data analytics

Table 1 Distribution of lower and upper reference intervals of creatinine in Pakistani male children

Age (yr)	n	Our study, LRI	Our study, URI	Tahmasebi et al[11], LRI	Tahmasebi et al[11], URI
< 2	9658	0.15 mg/dL (13 μmol/L)	0.39 mg/dL (34 μmol/L)	0.17 mg/dL (15 μmol/L)	0.52 mg/dL (46 μmol/L)
2- < 5	2964	0.15 mg/dL (13 μmol/L)	0.80 mg/dL (71 μmol/L)	0.18 mg/dL (16 μmol/L)	0.49 mg/dL (43 μmol/L)
5- < 9	2833	0.16 mg/dL (14 μmol/L)	0.69 mg/dL (61 μmol/L)	0.31 mg/dL (27 μmol/L)	0.61 mg/dL (54 μmol/L)
9- < 12	1796	0.27 mg/dL (24 μmol/L)	0.92 mg/dL (81 μmol/L)	0.41 mg/dL (36 μmol/L)	0.68 mg/dL (60 μmol/L)
12- < 15	2291	0.29 mg/dL (26 μmol/L)	1.06 mg/dL (94 μmol/L)	0.43 mg/dL (38 μmol/L)	0.85 mg/dL (75 μmol/L)
15- < 17	2378	0.40 mg/dL (35 μmol/L)	1.26 mg/dL (111 μmol/L)	0.61 mg/dL (54 μmol/L)	1.02 mg/dL (90 μmol/L)

LRI: Lower reference limit, URI: Upper reference limit.

Table 2 Distribution of lower and upper reference intervals of creatinine in Pakistani female children

Age (yr)	n	Our study, LRI	Our study, URI	Tahmasebi et al[11], LRI	Tahmasebi et al[11], URI
< 2	6323	0.12 mg/dL (11 μmol/L)	0.73 mg/dL (65 μmol/L)	0.17 mg/dL (15 μmol/L)	0.52 mg/dL (46 μmol/L)
2- < 5	2012	0.15 mg/dL (13 μmol/L)	0.74 mg/dL (65 μmol/L)	0.18 mg/dL (16 μmol/L)	0.49 mg/dL (43 μmol/L)
5- < 9	1997	0.16 mg/dL (14 μmol/L)	0.68 mg/dL (60 μmol/L)	0.31 mg/dL (27 μmol/L)	0.61 mg/dL (54 μmol/L)
9- < 12	1204	0.26 mg/dL (23 μmol/L)	0.78 mg/dL (69 μmol/L)	0.36 mg/dL (32 μmol/L)	0.63 mg/dL (56 μmol/L)
12- < 15	1573	0.24 mg/dL (21 μmol/L)	0.84 mg/dL (74 μmol/L)	0.40 mg/dL (35 μmol/L)	0.72 mg/dL (64 μmol/L)
15- < 17	1737	0.34 mg/dL (35 μmol/L)	0.93 mg/dL (82 μmol/L)	0.50 mg/dL (44 μmol/L)	0.77 mg/dL (68 μmol/L)

LRI: Lower reference limit; URI: Upper reference limit.