Table 4

Inter-individual variability in hourly urinary flow and creatinine excretion rates calculated from nocturnal urine collections

Urinary flow rate
 Creatinine excretion rate


Mean
(mL/h)
 Range
(Min-Max)
(mL/h)
 Percentiles (5–95th)
(mL/h)
 Max
Min
 CVa
%
 Mean
(mL/h)
 Range
(Min-Max)
(mL/h)
 Percentiles (5–95th)
(mL/h)
 Max
Min
 CVa
%
Adults









Urban
(n = 74)
 59.8
 7.21–133
 21.8–113
 18
 47.1
 0.049
 0.016–0.10
 0.019–0.084
 6.7
 36.4
Rural
(n = 109)
 63.4
 20.6–127
 29.7–108
 6.2
 38.7
 0.062
 0.020–0.14
 0.034–0.10
 7.1
 35.6
Both
(n = 183)
 62.0
 7.21–133
 26.4–112
 18
 42.1
 0.057
 0.016–0.14
 0.029–0.095
 9.2
 37.4
Children









Urban
(n = 74)
 32.0
 10.7–69.5
 13.4–61.9
 6.5
 48.0
 0.027
 0.011–0.082
 0.014–0.045
 7.7
 42.1
Rural
(n = 42)
 26.6
 10.8–64.6
 14.3–48.7
 6.0
 45.9
 0.025
 0.0071–0.065
 0.013–0.042
 9.1
 44.6
Both
(n = 116)
 30.1
 10.7–69.5
 13.6–61.4
 6.5
 48.2
 0.026
 0.0071–0.082
 0.014–0.045
 12
 43.1

aCV = coefficient of variation (standard deviation/mean × 100%)

Fortin et al. Environmental Health 2008 7:55   doi:10.1186/1476-069X-7-55

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