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Table 1 Reference intervals for serum cystatin C and serum creatinine according to sex

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

Parameter All (n = 381) Males (n = 194) Females (n = 187) p*
Age (years) 28 [23–40] 28 [24–40] 26 [22–43] 0.290
BSA (m2) 1.68 [1.55–1.79] 1.70 [1.81] 1.65 [1.52–1.76] 0.002*
Serum cystatin C (mg/L)
 Median [IQR] 0.80 [0.70–0.90] 0.90 [0.80–1.00] 0.80 [0.70–0.90] < 0.001
 2.5th percentile (90%CI) 0.60 (0.60–0.61) 0.70 (0.60–0.70) 0.57 (0.50–0.60)  
 97.5th percentile (90%CI) 1.10 (1.10–1.11) 1.10 (1.10–1.20) 1.03 (1.00–1.10)  
Serum creatinine (mg/dL)
 Median [IQR] 0.92 [0.77–1.06] 1.06 [0.96–1.14] 0.79 [0.71–0.88] < 0.001
 2.5th percentile (90% CI) 0.61 (0.59–0.64) 0.74 (0.70–0.80) 0.58 (0.54–0.61)  
 97.5th percentile (90% CI) 1.30 (1.28–1.35) 1.36 (1.30–1.45) 1.08 (1.02–1.21)  
  1. BSA body surface area, CI confidence interval, IQR interquartile range, SCysC serum cystatin C, SCr serum creatinine; The Mann-Whitney U-test was used for variable comparisons; *p < 0.05