BMI Zscore Calculation and its json file

Technical Support Development
1

Is there a file (json) that holds the zscore for bmi ? and also, what is the calculation needed in the form to do that like z-score,

And is that easy or hard to setup ?

Thanks and God Bless.

2

Hi @Marcelo_De_Guzman could you please elaborate more on the problem and the issue you are facing?

3

Hi @Marcelo_De_Guzman,
For calculation of z-score in the form for a patient given their sex, age, and weight is as follows:

z-score('weight-for-age', ../my_sex, ../my_age, ../my_weight)

CHT documentation provides more information about z-score which can be found here

4

But I think that z-score is only for malnutrition right?

Right now, we are developing the form that will also included to measure BMI.

5

Is that zscore can also use for calculating BMI and not only malnutrition ?

6

The z-score can be used for calculating anything. In the documentation that @niraj linked you can see the document that needs to be added to CouchDB as a lookup table. The first parameter of the z-score calculation has to match the charts.id property in the doc. This should be reasonably easy to set up. Please give that a try and let me know if you get stuck!

7

I’ve tried but it gives me blank values.

When I was checking the calculation for BMI Z score, it needs

  • weight (should be in kg)
  • height (in centimeter but need to convert it to meter squared)
  • age (in months)
  • gender (male or femal)

for getting bmi index = ( kg / m2) , so, it was like ( weight / (height * height)

then for bmi zscore, it was based on the WHO data for boys and girls.

So, it would look like

{
  "id" : "bmia-zscore",
  "data" : {
       "male": [  
          {
               key: {patient age in months}, 
               points: {bmi index from -4SD to +4SD}
           }
}

So, is it possible to include this on zscore-charts.json (that i have and added on couchdb) ?

and in the form for formula is round(z-score('bmia-zscore'(${patient_gender},${patient_age_in_months},${bmi_index}),3) or there is another file that I need to update ?

8

Hi @gareth and @marc, do you have any suggestions on what might be the issue?

9

hi @niraj ,

Thanks, it was working now.

2 Likes
10

@Marcelo_De_Guzman great to hear it is working. could you please mark the issue as solved? It would be helpful for future reference if others face similar issue.

11

How can I mark the issue as solve ?

12

Hi @Marcelo_De_Guzman
if you click on the ... near the post you feel resolved the issue, you can select a post as a solution.