Variation in Urinary Flow Rates According to Demographic Characteristics and Body Mass Index in NHANES: Potential Confounding of Associations between Health Outcomes and Urinary Biomarker Concentrations

http://dx.doi.org/10.1289/ehp.1408944



Table 1. Summary statistics (mean and key percentiles) for collected void volumes and time covered by collected void volumes.
Age group (years) n Mean p5 p25 p50 p75 p95
p, percentile.
First collected void volume (mL)
6–11 2,014 93 13 36 69 128 259
12–19 2,251 122 17 44 94 178 324
20–39 3,627 128 19 50 103 182 324
40–59 3,499 120 21 54 96 163 309
≥ 60 3,356 101 14 41 78 138 264
Composite collected volume (mL)
6–11 2,014 110 30 55 89 146 267
12–19 2,251 150 41 74 124 205 337
20–39 3,627 155 48 82 129 210 341
40–59 3,499 136 40 69 111 178 325
≥ 60 3,356 122 34 63 99 159 287
Time since previous void for first collected void (min)
6–11 1,993 178 48 90 141 213 444
12–19 2,231 192 47 87 149 222 582
20–39 3,604 159 43 81 128 192 375
40–59 3,491 138 42 75 117 170 296
≥ 60 3,334 135 42 76 116 173 277
Total time covered by composited voids (min)
6–11 2,014 194 58 110 165 225 459
12–19 2,251 214 60 118 178 245 582
20–39 3,627 182 55 104 160 218 386
40–59 3,499 153 46 88 131 191 317
≥ 60 3,356 159 52 94 145 206 301