Table 3

Intra-individual variability in hourly urinary flow rate and creatinine excretion rate over a 24-h period

Urinary flow rate
 Creatinine excretion rate


Mean
(mL/h)
 Min
(mL/h)
 Max
(mL/h)
 Max
Min
 CVa
%
 Mean
(g/h)
 Min
(g/h)
 Max
(g/h)
 Max
Min
 CVa
%
Subject 1
 66.9
 38.4
 96.5
 2.5
 36.1
 0.074
 0.043
 0.10
 2.4
 32.9
Subject 2
 67.7
 38.4
 107
 2.8
 48.2
 0.061
 0.055
 0.069
 1.3
 9.66
Subject 3
 120
 24.9
 437
 18
 101
 0.044
 0.031
 0.051
 1.7
 13.7
Subject 4
 119
 57.6
 176
 3.1
 42.3
 0.038
 0.030
 0.047
 1.6
 14.5
Subject 5
 68.8
 23.2
 123
 5.3
 57.0
 0.027
 0.012
 0.038
 3.2
 32.0
Subject 6
 46.2
 24.7
 62.4
 2.5
 42.0
 0.035
 0.028
 0.044
 1.6
 24.0
Subject 7
 91.0
 22.9
 185
 8.1
 77.7
 0.034
 0.026
 0.040
 1.5
 14.3
Subject 8
 53.9
 26.9
 107
 4.0
 68.5
 0.069
 0.065
 0.074
 1.1
 6.06
Subject 9
 38.0
 20.3
 57.3
 2.8
 40.0
 0.052
 0.049
 0.055
 1.1
 6.00
Subject10
 70.9
 25.1
 99.0
 3.9
 42.8
 0.037
 0.032
 0.045
 1.4
 15.4
Subject 11
 49.0
 24.0
 67.6
 2.8
 38.8
 0.037
 0.022
 0.047
 2.1
 31.0
Subject 12
 97.9
 21.3
 168
 7.9
 58.9
 0.033
 0.015
 0.044
 2.9
 34.0
Subject 13
 50.3
 28.3
 84.9
 3.0
 45.7
 0.065
 0.034
 0.082
 2.4
 27.6
Subject 14
 93.4
 53.5
 167
 3.1
 54.2
 0.055
 0.049
 0.077
 1.6
 17.9
Subject 15
 98.4
 14.6
 188
 13
 59.7
 0.037
 0.010
 0.063
 6.6
 48.4

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

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