Skip to main content

Table 3 Reference intervals for serum creatinine by age and sex

From: Reference intervals for serum cystatin C and serum creatinine in an adult sub-Saharan African population

Age (years) N = 381 Serum creatinine (mg/dL)
Median (IQR) 2.5th percentile (90%CI) 97.5th percentile (90%CI) p
< 20 Male: 9 1.09 (1.00–1.15) 0.80 (0.80–1.04) 1.18 < 0.001
Female: 14 0.76 (0.72–0.79) 0.66 (0.66–0.70) 0.88
All: 23 0.79 (0.75–1.08) 0.66 (0.66–0.70) 1.18
[20–30] Male: 95 1.03 (0.94–1.12) 0.80 (0.70–0.85) 1.30 (1.29–1.35) < 0.001
Female: 89 0.79 (0.71–0.87) 0.60 (0.54–0.61) 1.07 (1.01–1.28)
All: 184 0.91 (0.78–1.05) 0.61 (0.59–0.65) 1.30 (1.26–1.33)
[30–40] Male: 40 1.06 (0.95–1.13) 0.75 (0.69–0.81) 1.29 < 0.001
Female: 31 0.73 (0.65–0.83) 0.57 (0.57–0.60) 1.26
All: 71 0.94 (0.74–1.08) 0.58 (0.57–0.62) 1.27 (1.22–1.32)
[40–50] Male: 32 1.08 (0.99–1.17) 0.68 (0.68–0.74) 1.45 < 0.001
Female: 21 0.74 (0.69–0.90) 0.51 (0.51–0.66) 1.02
All: 53 0.99 (0.74–1.10) 0.61 (0.51–0.66) 1.38 (1.24–1.45)
≥ 50 Male: 18 1.17 (0.99–1.30) 0.79 (0.79–0.96) 1.52 < 0.001
Female: 32 0.85 (0.79–0.93) 0.60 (0.60–0.65) 1.05
All: 50 0.93 (0.81–1.06) 0.64 (0.60–0.66) 1.43 (1.33–1.52)
  1. CI confidence interval, IQR interquartile range. Some 90% confidence intervals are not presented due to the small number of participants in corresponding age groups. The Mann-Whitney U-test was used to compare males and females; the difference in the distribution of serum creatinine values between age-groups was not significant with the Kruskal-Wallis H-test (p = 0.491)