Difference between revisions of "Body weight in Finland"

Scope

What is the body weight in Finland for the general population and subgroups? A distribution for a random individual is given.

Definition

Data

Data 1

Estimate is a point estimate from [1].

----1: . This value should be used for the subgroup of pregnant mothers. --Jouni 17:15, 16 September 2009 (EEST) (type: truth; paradigms: science: comment)

General population Pregnant mothers
70 55

Data 2

Probability distribution of body weight of adults aged 18-55yr and over 55yr were extracted from [2]. For a given age group body weight data was summarized in terms of mean and the 95% confidence interval:

• 18-55yr: 77.6 (77.0-78.1),
• 55yr+: 76.5 (75.9-77.2).

Based on that a normal distribution was created. Since standard deviations (SDs) calculated from 2.5th and 97.5th percentiles were not exactly equal the larger SD was used as a standard deviation of a normal distribution.

Note: There was not measurements for ages 18-29yr, only for 30-55yr.

 Adults 18-55yr Adults  55yr+ mean of normal distribution 77.6 76.5 SD of normal distribution 0.31 0.36

Data 3

The most comprehensive information on body weights of Finnish children are gender specific growth curves. They were previously used to extract the mean and 95% confidence interval (CI) of body weight at each age (month or year) from 0 to 18 years. See results of variables: Body weight of 0-24 months old Finnish children and Body weight of 2-18 year old Finnish children. Based on this information probability distributions of body weights of children aged 0-2 years and 2-18 years were constructed. Body weights of males and females are studied separately. It was assumed that the body weight for each 1-month or 1-year age specific interval follows a normal distribution with mean being the mean reported in growth tables and standard deviation (SD) being the larger value of SDs calculated from the bounds of the 95% CI. 2500 values of body weights for each 1-month and 1-year age interval were simulated from respective normal distributions and then grouped to match groups 0-2 years (months from 0 to 24) and 2-18 years (years from 2 to 18). Since none of parametric distributions fits the resulting data sets the empirical distribution of body weights was constructed. Moreover, based on simulated data the Spearman's rank correlation between age and body weight in different age/gender subgroups was calculated.

Results of one simulation. For each age/gender group mean value, standard deviation (sd) and five percentiles (5th, 25th, 50th , 75th and 95th) are provided.

 0-2 years males 0-2 years females 2-18 years males 2-18 years females mean 9.4105 9.1249 31.4799 31.186 sd 2.7969 2.8061 16.0825 15.3681 p5 3.961 3.8875 12.5255 12.1115 p25 7.6278 7.2345 18.2514 18.1586 p50 9.9635 9.5678 27.642 27.286 p75 11.4834 11.2236 41.0361 43.5152 p95 13.2375 13.1518 63.522 59.1031

Spearman's rank correlation per age and gender:

 0-2 years males 0-2 years females 2-18 years males 2-18 years females Spearman's rank correlation 0.866 0.878 0.963 0.953

List of parents:

kg

Formula

Analytica_id:

<anacode> Table(Preg_gen)(55,70) </anacode>

Result

For the current version, only the subgroup of pregnant women is uploaded.

References

1. Database of statistics Finland (www.stat.fi)
2. KTL (www.ktl.fi)