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TABLE J-2 Mean and Selected Percentiles of Serum Sodium (mmol/L): United States, NHANES III, 1988–1994

Sex/Age Categorya

n

Mean

Percentile

1st

5th

10th

M, 14–18 y

1,196

141.4

138.6

139.5

139.9

Standard error

 

0.1

0.2

0.2

0.1

M, 19–50 y

4,277

141.7

138.7

139.7

140.1

Standard error

 

0.1

0.2

0.2

0.1

M, 51–70 y

1,953

141.5

137.9

139.1

139.7

Standard error

 

0.1

0.2

0.2

0.2

M, 71+ y

1,328

141.6

137.9

139.1

139.7

Standard error

 

0.1

0.2

0.2

0.2

F, 14–18 y

1,269

140.8

136.4

138.3

138.9

Standard error

 

1.3

8.8

3.4

2.3

F, 19–50 y

4,675

140.9

137.5

138.4

139.0

Standard error

 

0.1

0.2

0.2

0.1

F, 51–70 y

2,046

141.5

136.4

138.3

139.1

Standard error

 

0.1

0.6

0.3

0.3

F, 71+ y

1,489

141.3

135.6

137.7

138.6

Standard error

 

0.2

0.4

0.3

0.3

Pregnant

323

138.8

134.5

136.3

137.0

Standard error

 

0.2

0.8

0.5

0.4

Lactating

100

141.9

139.3

140.2

140.6

Standard error

 

0.3

0.5

0.3

0.3

a M = male, F = female (not pregnant and/or lactating).

NOTE: Data were adjusted using the Iowa State University method to provide estimates of usual serum potassium concentrations. Means, standard errors, and percentiles were obtained using C-Side. Standard errors were estimated via jackknife replication. Each standard error has 49 degrees of freedom. Females who had “blank but applicable” pregnancy or lactating status data or who responded “I don’t know” to questions on pregnancy or lactating status were excluded from the analysis.



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